Find the smallest prime palindrome greater than or equal to N.
Recall that a number is prime if it's only divisors are 1 and itself, and it is greater than 1. 
For example, 2,3,5,7,11 and 13 are primes.
Recall that a number is a palindrome if it reads the same from left to right as it does from right to left. 
For example, 12321 is a palindrome.
 

Example 1:
Input: 6
Output: 7


Example 2:
Input: 8
Output: 11


Example 3:
Input: 13
Output: 101



 
Note:

1 <= N <= 10^8
The answer is guaranteed to exist and be less than 2 * 10^8.

Difficulty: MEDIUM
Tags: Mathematics

Starter code:
class Solution:
    def primePalindrome(self, N: int) -> int:
        

Solutions:
import bisect

class Solution:

	def primePalindrome(self, N: int) -> int:
		return primes[bisect.bisect_left(primes, N)]
primes = [2, 3, 5, 7, 11, 101, 131, 151, 181, 191, 313, 353, 373, 383, 727, 757, 787, 797, 919, 929, 10301, 10501, 10601, 11311, 11411, 12421, 12721, 12821, 13331, 13831, 13931, 14341, 14741, 15451, 15551, 16061, 16361, 16561, 16661, 17471, 17971, 18181, 18481, 19391, 19891, 19991, 30103, 30203, 30403, 30703, 30803, 31013, 31513, 32323, 32423, 33533, 34543, 34843, 35053, 35153, 35353, 35753, 36263, 36563, 37273, 37573, 38083, 38183, 38783, 39293, 70207, 70507, 70607, 71317, 71917, 72227, 72727, 73037, 73237, 73637, 74047, 74747, 75557, 76367, 76667, 77377, 77477, 77977, 78487, 78787, 78887, 79397, 79697, 79997, 90709, 91019, 93139, 93239, 93739, 94049, 94349, 94649, 94849, 94949, 95959, 96269, 96469, 96769, 97379, 97579, 97879, 98389, 98689, 1003001, 1008001, 1022201, 1028201, 1035301, 1043401, 1055501, 1062601, 1065601, 1074701, 1082801, 1085801, 1092901, 1093901, 1114111, 1117111, 1120211, 1123211, 1126211, 1129211, 1134311, 1145411, 1150511, 1153511, 1160611, 1163611, 1175711, 1177711, 1178711, 1180811, 1183811, 1186811, 1190911, 1193911, 1196911, 1201021, 1208021, 1212121, 1215121, 1218121, 1221221, 1235321, 1242421, 1243421, 1245421, 1250521, 1253521, 1257521, 1262621, 1268621, 1273721, 1276721, 1278721, 1280821, 1281821, 1286821, 1287821, 1300031, 1303031, 1311131, 1317131, 1327231, 1328231, 1333331, 1335331, 1338331, 1343431, 1360631, 1362631, 1363631, 1371731, 1374731, 1390931, 1407041, 1409041, 1411141, 1412141, 1422241, 1437341, 1444441, 1447441, 1452541, 1456541, 1461641, 1463641, 1464641, 1469641, 1486841, 1489841, 1490941, 1496941, 1508051, 1513151, 1520251, 1532351, 1535351, 1542451, 1548451, 1550551, 1551551, 1556551, 1557551, 1565651, 1572751, 1579751, 1580851, 1583851, 1589851, 1594951, 1597951, 1598951, 1600061, 1609061, 1611161, 1616161, 1628261, 1630361, 1633361, 1640461, 1643461, 1646461, 1654561, 1657561, 1658561, 1660661, 1670761, 1684861, 1685861, 1688861, 1695961, 1703071, 1707071, 1712171, 1714171, 1730371, 1734371, 1737371, 1748471, 1755571, 1761671, 1764671, 1777771, 1793971, 1802081, 1805081, 1820281, 1823281, 1824281, 1826281, 1829281, 1831381, 1832381, 1842481, 1851581, 1853581, 1856581, 1865681, 1876781, 1878781, 1879781, 1880881, 1881881, 1883881, 1884881, 1895981, 1903091, 1908091, 1909091, 1917191, 1924291, 1930391, 1936391, 1941491, 1951591, 1952591, 1957591, 1958591, 1963691, 1968691, 1969691, 1970791, 1976791, 1981891, 1982891, 1984891, 1987891, 1988891, 1993991, 1995991, 1998991, 3001003, 3002003, 3007003, 3016103, 3026203, 3064603, 3065603, 3072703, 3073703, 3075703, 3083803, 3089803, 3091903, 3095903, 3103013, 3106013, 3127213, 3135313, 3140413, 3155513, 3158513, 3160613, 3166613, 3181813, 3187813, 3193913, 3196913, 3198913, 3211123, 3212123, 3218123, 3222223, 3223223, 3228223, 3233323, 3236323, 3241423, 3245423, 3252523, 3256523, 3258523, 3260623, 3267623, 3272723, 3283823, 3285823, 3286823, 3288823, 3291923, 3293923, 3304033, 3305033, 3307033, 3310133, 3315133, 3319133, 3321233, 3329233, 3331333, 3337333, 3343433, 3353533, 3362633, 3364633, 3365633, 3368633, 3380833, 3391933, 3392933, 3400043, 3411143, 3417143, 3424243, 3425243, 3427243, 3439343, 3441443, 3443443, 3444443, 3447443, 3449443, 3452543, 3460643, 3466643, 3470743, 3479743, 3485843, 3487843, 3503053, 3515153, 3517153, 3528253, 3541453, 3553553, 3558553, 3563653, 3569653, 3586853, 3589853, 3590953, 3591953, 3594953, 3601063, 3607063, 3618163, 3621263, 3627263, 3635363, 3643463, 3646463, 3670763, 3673763, 3680863, 3689863, 3698963, 3708073, 3709073, 3716173, 3717173, 3721273, 3722273, 3728273, 3732373, 3743473, 3746473, 3762673, 3763673, 3765673, 3768673, 3769673, 3773773, 3774773, 3781873, 3784873, 3792973, 3793973, 3799973, 3804083, 3806083, 3812183, 3814183, 3826283, 3829283, 3836383, 3842483, 3853583, 3858583, 3863683, 3864683, 3867683, 3869683, 3871783, 3878783, 3893983, 3899983, 3913193, 3916193, 3918193, 3924293, 3927293, 3931393, 3938393, 3942493, 3946493, 3948493, 3964693, 3970793, 3983893, 3991993, 3994993, 3997993, 3998993, 7014107, 7035307, 7036307, 7041407, 7046407, 7057507, 7065607, 7069607, 7073707, 7079707, 7082807, 7084807, 7087807, 7093907, 7096907, 7100017, 7114117, 7115117, 7118117, 7129217, 7134317, 7136317, 7141417, 7145417, 7155517, 7156517, 7158517, 7159517, 7177717, 7190917, 7194917, 7215127, 7226227, 7246427, 7249427, 7250527, 7256527, 7257527, 7261627, 7267627, 7276727, 7278727, 7291927, 7300037, 7302037, 7310137, 7314137, 7324237, 7327237, 7347437, 7352537, 7354537, 7362637, 7365637, 7381837, 7388837, 7392937, 7401047, 7403047, 7409047, 7415147, 7434347, 7436347, 7439347, 7452547, 7461647, 7466647, 7472747, 7475747, 7485847, 7486847, 7489847, 7493947, 7507057, 7508057, 7518157, 7519157, 7521257, 7527257, 7540457, 7562657, 7564657, 7576757, 7586857, 7592957, 7594957, 7600067, 7611167, 7619167, 7622267, 7630367, 7632367, 7644467, 7654567, 7662667, 7665667, 7666667, 7668667, 7669667, 7674767, 7681867, 7690967, 7693967, 7696967, 7715177, 7718177, 7722277, 7729277, 7733377, 7742477, 7747477, 7750577, 7758577, 7764677, 7772777, 7774777, 7778777, 7782877, 7783877, 7791977, 7794977, 7807087, 7819187, 7820287, 7821287, 7831387, 7832387, 7838387, 7843487, 7850587, 7856587, 7865687, 7867687, 7868687, 7873787, 7884887, 7891987, 7897987, 7913197, 7916197, 7930397, 7933397, 7935397, 7938397, 7941497, 7943497, 7949497, 7957597, 7958597, 7960697, 7977797, 7984897, 7985897, 7987897, 7996997, 9002009, 9015109, 9024209, 9037309, 9042409, 9043409, 9045409, 9046409, 9049409, 9067609, 9073709, 9076709, 9078709, 9091909, 9095909, 9103019, 9109019, 9110119, 9127219, 9128219, 9136319, 9149419, 9169619, 9173719, 9174719, 9179719, 9185819, 9196919, 9199919, 9200029, 9209029, 9212129, 9217129, 9222229, 9223229, 9230329, 9231329, 9255529, 9269629, 9271729, 9277729, 9280829, 9286829, 9289829, 9318139, 9320239, 9324239, 9329239, 9332339, 9338339, 9351539, 9357539, 9375739, 9384839, 9397939, 9400049, 9414149, 9419149, 9433349, 9439349, 9440449, 9446449, 9451549, 9470749, 9477749, 9492949, 9493949, 9495949, 9504059, 9514159, 9526259, 9529259, 9547459, 9556559, 9558559, 9561659, 9577759, 9583859, 9585859, 9586859, 9601069, 9602069, 9604069, 9610169, 9620269, 9624269, 9626269, 9632369, 9634369, 9645469, 9650569, 9657569, 9670769, 9686869, 9700079, 9709079, 9711179, 9714179, 9724279, 9727279, 9732379, 9733379, 9743479, 9749479, 9752579, 9754579, 9758579, 9762679, 9770779, 9776779, 9779779, 9781879, 9782879, 9787879, 9788879, 9795979, 9801089, 9807089, 9809089, 9817189, 9818189, 9820289, 9822289, 9836389, 9837389, 9845489, 9852589, 9871789, 9888889, 9889889, 9896989, 9902099, 9907099, 9908099, 9916199, 9918199, 9919199, 9921299, 9923299, 9926299, 9927299, 9931399, 9932399, 9935399, 9938399, 9957599, 9965699, 9978799, 9980899, 9981899, 9989899, 100030001, 100050001, 100060001, 100111001, 100131001, 100161001, 100404001, 100656001, 100707001, 100767001, 100888001, 100999001, 101030101, 101060101, 101141101, 101171101, 101282101, 101292101, 101343101, 101373101, 101414101, 101424101, 101474101, 101595101, 101616101, 101717101, 101777101, 101838101, 101898101, 101919101, 101949101, 101999101, 102040201, 102070201, 102202201, 102232201, 102272201, 102343201, 102383201, 102454201, 102484201, 102515201, 102676201, 102686201, 102707201, 102808201, 102838201, 103000301, 103060301, 103161301, 103212301, 103282301, 103303301, 103323301, 103333301, 103363301, 103464301, 103515301, 103575301, 103696301, 103777301, 103818301, 103828301, 103909301, 103939301, 104000401, 104030401, 104040401, 104111401, 104222401, 104282401, 104333401, 104585401, 104616401, 104787401, 104838401, 104919401, 104949401, 105121501, 105191501, 105202501, 105262501, 105272501, 105313501, 105323501, 105343501, 105575501, 105616501, 105656501, 105757501, 105818501, 105868501, 105929501, 106060601, 106111601, 106131601, 106191601, 106222601, 106272601, 106353601, 106444601, 106464601, 106545601, 106555601, 106717601, 106909601, 106929601, 107000701, 107070701, 107121701, 107232701, 107393701, 107414701, 107424701, 107595701, 107636701, 107646701, 107747701, 107757701, 107828701, 107858701, 107868701, 107888701, 107939701, 107949701, 108070801, 108101801, 108121801, 108151801, 108212801, 108323801, 108373801, 108383801, 108434801, 108464801, 108484801, 108494801, 108505801, 108565801, 108686801, 108707801, 108767801, 108838801, 108919801, 108959801, 109000901, 109101901, 109111901, 109161901, 109333901, 109404901, 109434901, 109444901, 109474901, 109575901, 109656901, 109747901, 109777901, 109797901, 109818901, 109909901, 109929901, 110111011, 110232011, 110252011, 110343011, 110424011, 110505011, 110565011, 110676011, 110747011, 110757011, 110909011, 110949011, 110999011, 111010111, 111020111, 111050111, 111070111, 111181111, 111191111, 111262111, 111272111, 111454111, 111484111, 111515111, 111616111, 111686111, 111757111, 111848111, 112030211, 112060211, 112111211, 112161211, 112171211, 112212211, 112434211, 112494211, 112545211, 112636211, 112878211, 112959211, 112969211, 112989211, 113030311, 113090311, 113111311, 113262311, 113282311, 113474311, 113535311, 113565311, 113616311, 113636311, 113888311, 113939311, 114040411, 114191411, 114232411, 114353411, 114383411, 114484411, 114494411, 114535411, 114727411, 114808411, 114818411, 114848411, 114878411, 114898411, 115000511, 115020511, 115060511, 115111511, 115141511, 115191511, 115212511, 115222511, 115404511, 115464511, 115545511, 115636511, 115737511, 115767511, 115797511, 115828511, 115959511, 116000611, 116010611, 116040611, 116424611, 116505611, 116646611, 116696611, 116757611, 116777611, 116828611, 116868611, 116919611, 117070711, 117101711, 117262711, 117272711, 117323711, 117484711, 117505711, 117515711, 117616711, 117686711, 117757711, 117767711, 117797711, 117818711, 117959711, 118252811, 118272811, 118414811, 118464811, 118525811, 118626811, 118686811, 118696811, 118717811, 118818811, 118848811, 118909811, 118959811, 119010911, 119171911, 119202911, 119343911, 119363911, 119454911, 119585911, 119595911, 119646911, 119676911, 119696911, 119717911, 119787911, 119868911, 119888911, 119969911, 120191021, 120242021, 120434021, 120454021, 120494021, 120535021, 120565021, 120646021, 120808021, 120868021, 120989021, 121080121, 121111121, 121131121, 121161121, 121272121, 121282121, 121393121, 121414121, 121555121, 121747121, 121818121, 121878121, 121939121, 121989121, 122040221, 122232221, 122262221, 122292221, 122333221, 122363221, 122373221, 122393221, 122444221, 122484221, 122535221, 122696221, 122787221, 122858221, 122919221, 123161321, 123292321, 123424321, 123484321, 123494321, 123575321, 123767321, 123838321, 123989321, 124000421, 124080421, 124101421, 124131421, 124252421, 124323421, 124333421, 124434421, 124515421, 124525421, 124626421, 124656421, 124717421, 124737421, 124959421, 124989421, 125000521, 125010521, 125232521, 125252521, 125292521, 125343521, 125474521, 125505521, 125565521, 125606521, 125616521, 125757521, 125838521, 125939521, 125979521, 125999521, 126101621, 126161621, 126181621, 126202621, 126212621, 126323621, 126424621, 126484621, 126535621, 126595621, 126616621, 126676621, 126686621, 126727621, 126737621, 126757621, 126878621, 127060721, 127090721, 127131721, 127212721, 127383721, 127494721, 127545721, 127636721, 127656721, 127686721, 127717721, 127747721, 127828721, 127909721, 127929721, 128070821, 128090821, 128121821, 128181821, 128202821, 128252821, 128262821, 128282821, 128444821, 128474821, 128525821, 128535821, 128595821, 128646821, 128747821, 128787821, 128868821, 128919821, 128939821, 129080921, 129202921, 129292921, 129323921, 129373921, 129484921, 129494921, 129535921, 129737921, 129919921, 129979921, 130020031, 130030031, 130060031, 130141031, 130171031, 130222031, 130333031, 130444031, 130464031, 130545031, 130555031, 130585031, 130606031, 130636031, 130717031, 130767031, 130818031, 130828031, 130858031, 130969031, 131030131, 131111131, 131121131, 131222131, 131252131, 131333131, 131555131, 131565131, 131585131, 131646131, 131676131, 131828131, 132010231, 132191231, 132464231, 132535231, 132595231, 132646231, 132676231, 132757231, 133020331, 133060331, 133111331, 133161331, 133252331, 133474331, 133494331, 133575331, 133686331, 133767331, 133818331, 133909331, 134090431, 134181431, 134232431, 134424431, 134505431, 134525431, 134535431, 134616431, 134757431, 134808431, 134858431, 134888431, 134909431, 134919431, 134979431, 135010531, 135040531, 135101531, 135121531, 135161531, 135262531, 135434531, 135494531, 135515531, 135626531, 135646531, 135707531, 135838531, 135868531, 135878531, 135929531, 135959531, 135979531, 136090631, 136171631, 136222631, 136252631, 136303631, 136363631, 136474631, 136545631, 136737631, 136797631, 136818631, 136909631, 136969631, 137030731, 137040731, 137060731, 137090731, 137151731, 137171731, 137232731, 137282731, 137333731, 137363731, 137424731, 137474731, 137606731, 137636731, 137696731, 137757731, 137808731, 137838731, 137939731, 137999731, 138040831, 138131831, 138242831, 138292831, 138313831, 138383831, 138454831, 138575831, 138616831, 138646831, 138757831, 138898831, 138959831, 138989831, 139131931, 139161931, 139222931, 139252931, 139282931, 139383931, 139474931, 139515931, 139606931, 139626931, 139717931, 139848931, 139959931, 139969931, 139999931, 140000041, 140030041, 140151041, 140303041, 140505041, 140565041, 140606041, 140777041, 140787041, 140828041, 140868041, 140898041, 141020141, 141070141, 141131141, 141151141, 141242141, 141262141, 141313141, 141343141, 141383141, 141484141, 141494141, 141575141, 141595141, 141616141, 141767141, 141787141, 141848141, 142000241, 142030241, 142080241, 142252241, 142272241, 142353241, 142363241, 142464241, 142545241, 142555241, 142686241, 142707241, 142797241, 142858241, 142888241, 143090341, 143181341, 143262341, 143303341, 143454341, 143474341, 143585341, 143636341, 143787341, 143828341, 143919341, 143969341, 144010441, 144020441, 144202441, 144212441, 144313441, 144353441, 144404441, 144434441, 144484441, 144505441, 144707441, 144757441, 144808441, 144818441, 144848441, 144878441, 144898441, 144979441, 144989441, 145020541, 145030541, 145090541, 145353541, 145363541, 145393541, 145464541, 145494541, 145575541, 145666541, 145767541, 146030641, 146040641, 146181641, 146222641, 146252641, 146313641, 146363641, 146505641, 146555641, 146565641, 146676641, 146858641, 146909641, 147191741, 147232741, 147242741, 147313741, 147343741, 147373741, 147434741, 147515741, 147565741, 147616741, 147686741, 147707741, 147757741, 147838741, 147929741, 148020841, 148060841, 148080841, 148414841, 148444841, 148525841, 148545841, 148585841, 148666841, 148686841, 148707841, 148818841, 148858841, 148888841, 148969841, 149000941, 149333941, 149343941, 149484941, 149535941, 149555941, 149616941, 149646941, 149696941, 149858941, 149888941, 149909941, 149919941, 149939941, 150070051, 150151051, 150181051, 150202051, 150272051, 150434051, 150494051, 150505051, 150626051, 150686051, 150727051, 150808051, 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class Solution:

	def next_palindrome(self, n):
		if self.AreAll9s(n):
			pal = str(1)
			for i in range(1, len(str(n))):
				pal = pal + str(0)
			pal = pal + str(1)
			return int(pal)
		x = len(str(n))
		if x > 2:
			first_num = n // 10 ** (x - 1)
			if x % 2 == 0:
				pal = str(1)
				for i in range(1, len(str(n))):
					pal = pal + str(0)
				pal = pal + str(1)
				return int(pal)
			if first_num % 2 == 0 or first_num % 5 == 0:
				n = (first_num + 1) * 10 ** (x - 1)
		if x % 2 == 0:
			first_half = n // 10 ** (x // 2)
			first_half_reversed = str(first_half)[::-1]
			second_half = n % 10 ** (x // 2)
			if int(first_half_reversed) > second_half:
				return int(str(first_half) + first_half_reversed)
			else:
				first_half = first_half + 1
				pal = str(first_half) + str(first_half)[::-1]
				return int(pal)
		else:
			first_half = n // 10 ** (x // 2)
			second_half = n % (10 ** x // 2)
			first_half_reversed = str(first_half // 10)[::-1]
			if int(first_half_reversed) > second_half:
				return int(str(first_half) + first_half_reversed)
			else:
				first_half = first_half + 1
				pal = str(first_half) + str(first_half // 10)[::-1]
				return int(pal)

	def AreAll9s(self, n):
		for i in str(n):
			if int(i) != 9:
				return 0
		return 1

	def mrange(self, start, stop, step):
		while start < stop:
			yield start
			start += step

	def check_prime(self, num):
		if num == 2:
			return True
		if num < 2 or num % 2 == 0:
			return False
		return all((num % i for i in self.mrange(3, int(num ** 0.5) + 1, 2)))

	def primePalindrome(self, N: int) -> int:
		x = N
		while x >= N:
			if x > 11:
				x = self.next_palindrome(x)
				if self.check_prime(x):
					return x
			else:
				if self.check_prime(x):
					return x
				x = x + 1


class Solution:

	def primePalindrome(self, N: int) -> int:

		def checkPrime(x):
			if x == 1:
				return False
			for i in range(2, int(math.sqrt(x) + 0.01) + 1):
				if x % i == 0:
					return False
			return True

		def makePal(ni):
			n = str(ni)
			l = len(n)
			hn = n[:l // 2]
			rhn = ''.join(reversed(hn))
			if l % 2 != 0:
				return int(hn + n[l // 2] + rhn)
			else:
				return int(hn + rhn)

		def nextPal(n):
			n = n + 10 ** (len(str(n)) // 2)
			return makePal(n)
		n = makePal(N)
		if n < N:
			n = nextPal(n)
		while True:
			if checkPrime(n):
				return n
			n = nextPal(n)


class Solution:

	def primePalindrome(self, N: int) -> int:

		def isPrime(num):
			if num < 2:
				return False
			for i in range(2, int(sqrt(num)) + 1):
				if num % i == 0:
					return False
			return True
		for length in range(1, 6):
			for i in range(10 ** (length - 1), 10 ** length):
				num = str(i)
				palindrome = int(num + num[-2::-1])
				if palindrome >= N and isPrime(palindrome):
					return min(palindrome, 11) if N <= 11 else palindrome
		return 0


class Solution:

	def primePalindrome(self, N: int) -> int:
		if N == 1:
			return 2
		if N <= 3 or N == 5 or N == 7:
			return N
		if N == 4:
			return 5
		if N == 6:
			return 7
		if N <= 11:
			return 11
		for i in range(10, 2 * 10 ** 4):
			s = str(i)
			num = int(s + s[:-1][::-1])
			if num >= N and self.is_prime(num):
				return num

	def is_prime(self, num):
		i = 2
		while i * i <= num:
			if num % i == 0:
				return False
			i += 1
		return True


class Solution:

	def primePalindrome(self, N: int) -> int:

		def get_palindromes(n):
			if n == 1:
				for i in range(10):
					yield i
			elif n % 2 == 0:
				d = n // 2
				for i in range(10 ** (d - 1), 10 ** d):
					s = str(i)
					yield int(s + s[::-1])
			else:
				d = n // 2
				for i in range(10 ** (d - 1), 10 ** d):
					s = str(i)
					for j in range(10):
						yield int(s + str(j) + s[::-1])

		def check_prime(num):
			if num == 1:
				return False
			elif num == 2:
				return True
			for i in range(2, int(num ** 0.5 + 1)):
				if num % i == 0:
					return False
			return True
		digits = len(str(N))
		while True:
			for n in get_palindromes(digits):
				if n >= N and check_prime(n):
					return n
			digits += 1


class Solution:

	def is_prime(self, N):
		if N == 1:
			return False
		for i in range(2, int(math.sqrt(N)) + 1):
			if N % i == 0:
				return False
		else:
			return True

	def primePalindrome(self, N: int) -> int:
		if N >= 8 and N <= 11:
			return 11
		for i in range(1, 100000):
			s = str(i)
			d = s[::-1]
			y = int(s + d[1:])
			if y >= N and self.is_prime(y):
				return y


from math import sqrt

class Solution:

	def primePalindrome(self, N: int) -> int:
		ans = 9999999999
		MAX_K = 20000
		if 8 <= N <= 11:
			return 11
		for i in range(2, MAX_K):
			o = make_odd_palindrome(i)
			if o >= N and is_prime(o):
				return o
		return ans

def make_odd_palindrome(n: int) -> int:
	s = str(n)
	p = s[:-1]
	odd = int(p + s[-1] + p[::-1])
	return odd

def is_prime(n: int) -> bool:
	for i in range(2, int(sqrt(n)) + 5):
		if n % i == 0 and n != i:
			return False
	return True


class Solution:

	def primePalindrome(self, N: int) -> int:
		if N < 12:
			for i in range(1, 12):
				if self.isPrime(i) and i >= N:
					return i
		strN = str(N)
		strLen = len(strN)
		if strLen % 2 == 0:
			startPoint = 10 ** (strLen - strLen // 2)
		else:
			startPoint = int(strN[:strLen - strLen // 2])
		for point in range(startPoint, 10 ** 6):
			strPoint = str(point)
			palindrome = int(strPoint + strPoint[-2::-1])
			if palindrome >= N and self.isPrime(palindrome):
				return palindrome

	def isPrime(self, p):
		return p > 1 and all((p % d for d in range(2, int(p ** 0.5) + 1)))


class Solution(object):

	def primePalindrome(self, N):

		def is_prime(n):
			return n > 1 and all((n % d for d in range(2, int(n ** 0.5) + 1)))
		for length in range(1, 6):
			for root in range(10 ** (length - 1), 10 ** length):
				s = str(root)
				x = int(s + s[-2::-1])
				if x >= N and is_prime(x):
					return x
			for root in range(10 ** (length - 1), 10 ** length):
				s = str(root)
				x = int(s + s[-1::-1])
				if x >= N and is_prime(x):
					return x


class Solution:

	def primePalindrome(self, N: int) -> int:
		digits = len(str(N))
		while True:
			for num in self.get_pali(digits):
				if num >= N and self.is_prime(num):
					return num
			digits += 1

	def get_pali(self, digits):
		if digits == 0:
			yield 0
		elif digits == 1:
			for i in range(10):
				yield i
		elif digits % 2 == 0:
			half = digits // 2
			for i in range(10 ** (half - 1), 10 ** half):
				yield int(str(i) + str(i)[::-1])
		else:
			half = digits // 2
			for i in range(10 ** (half - 1), 10 ** half):
				for j in range(10):
					yield int(str(i) + str(j) + str(i)[::-1])

	def is_prime(self, num):
		if num < 2:
			return False
		if num == 2:
			return True
		for i in range(2, int(num ** 0.5 + 1)):
			if num % i == 0:
				return False
		return True


class Solution:

	def is_prime(n: int) -> bool:
		i = 2
		while i * i <= n:
			if n % i == 0:
				return False
			i = i + 1
		return True

	def is_palindrome(n: int) -> bool:
		num_string = str(n)
		num_length = len(num_string)
		if num_string[num_length - 1] == 0:
			return False
		i = 0
		while i < num_length - i - 1:
			if num_string[i] != num_string[num_length - i - 1]:
				return False
			i = i + 1
		return True

	def prime_palindrome(n: int) -> int:
		answer = n
		if answer <= 2:
			return 2
		if 7 < answer <= 11:
			return 11
		if answer % 2 == 0:
			answer = answer + 1
		while True:
			num_length = len(str(answer))
			if num_length % 2 == 0:
				answer = 10 ** num_length + 1
				continue
			elif Solution.is_palindrome(answer) and Solution.is_prime(answer):
				return answer
			answer = answer + 2

	def primePalindrome(self, N: int) -> int:
		return Solution.prime_palindrome(N)


class Solution:

	def primePalindrome(self, N: int) -> int:

		def isprime(i):
			if i == 1:
				return False
			for j in range(2, int(i ** 0.5) + 1):
				if i % j == 0:
					return False
			return True
		i = N
		while i < 2 * 10 ** 10:
			x = str(i)
			if len(x) % 2 == 0 and len(x) > 2:
				i = 10 ** len(x)
				continue
			elif x == x[::-1]:
				if isprime(i):
					return i
			i += 1


class Solution:

	def primePalindrome(self, N: int) -> int:

		def isPrime(n):
			return n > 1 and all((n % f for f in range(2, int(n ** 0.5) + 1)))

		def isPalin(n):
			tmp = str(n)
			return tmp == tmp[::-1]
		while True:
			if isPalin(N) and isPrime(N):
				return N
			N += 1
			if 12 <= N <= 99:
				N = 100
			elif 1000 <= N <= 9999:
				N = 10000
			elif 100000 <= N <= 999999:
				N = 1000000
			elif 10000000 <= N <= 99999999:
				N = 100000000


class Solution:

	def primePalindrome(self, N: int) -> int:
		if N == 1 or N == 2:
			return 2

		def isprime(k):
			j = 3
			while j * j <= k:
				if k % j == 0:
					return False
				j += 2
			return True
		i = N // 2 * 2 + 1
		while i < 10 ** 7:
			if str(i) == str(i)[::-1]:
				if isprime(i):
					return i
			i += 2
		return 100030001


class Solution:

	def primePalindrome(self, N: int) -> int:
		if N == 1:
			return 2
		N_ary = []
		compute_N = N
		while not compute_N == 0:
			N_ary.insert(0, compute_N % 10)
			compute_N //= 10
		middle = len(N_ary) // 2
		for i in range(middle, len(N_ary)):
			N_ary[i] = N_ary[len(N_ary) - 1 - i] = min(N_ary[i], N_ary[len(N_ary) - 1 - i])
		result = 0
		while True:
			num = self.ary_to_int(N_ary)
			if num < N:
				N_ary = self.compute_next_ary(N_ary)
				continue
			is_prime = True
			for i in range(2, num):
				if i ** 2 > num:
					break
				if num % i == 0:
					is_prime = False
					break
			if is_prime == True:
				result = num
				break
			N_ary = self.compute_next_ary(N_ary)
		return result

	def ary_to_int(self, ary: List[int]) -> int:
		result = 0
		for num in ary:
			result = result * 10 + num
		return result

	def compute_next_ary(self, ary: List[int]) -> List[int]:
		middle = len(ary) // 2
		is_all_nine = True
		for i in range(middle, len(ary)):
			if not ary[i] == 9:
				is_all_nine = False
				break
		if is_all_nine:
			ary = [0 for i in range(len(ary) + 1)]
			ary[0] = ary[-1] = 1
			return ary
		for i in range(middle, len(ary)):
			if ary[i] == 9:
				ary[i] = ary[len(ary) - 1 - i] = 0
			else:
				ary[i] = ary[len(ary) - 1 - i] = ary[i] + 1
				break
		return ary


class Solution:

	def primePalindrome(self, N: int) -> int:

		def even_palindrome(n: int) -> int:
			return int(str(n) + str(n)[::-1])

		def odd_palindrome(n: int) -> int:
			return int(str(n) + str(n)[::-1][1:])

		def is_prime(n: int) -> int:
			return n > 1 and all((n % i for i in range(2, int(n ** 0.5) + 1)))
		(odd, even) = (1, 1)
		while True:
			next_even = even_palindrome(even)
			next_odd = odd_palindrome(odd)
			cur = min(next_even, next_odd)
			if cur >= N and is_prime(cur):
				return cur
			if next_even > next_odd:
				odd += 1
			else:
				even += 1


class Solution:

	def primePalindrome(self, N: int) -> int:

		def isPrime(n):
			if n > 1:
				if n == 2:
					return True
				if n % 2 == 0:
					return False
				for x in range(3, int(n ** 0.5 + 1), 2):
					if n % x == 0:
						return False
				return True
			return False

		def nextPalind(N):
			i = N + 1
			while True:
				if str(i) == str(i)[::-1]:
					return i
				else:
					i += 1
		if N >= 9989900:
			return 100030001
		if isPrime(N) and str(N) == str(N)[::-1]:
			return N
		else:
			i = nextPalind(N)
			while not isPrime(i):
				i = nextPalind(i)
			return i


class Solution:

	def primePalindrome(self, N: int) -> int:
		if N == 1:
			return 2
		import math

		def isPrime(n):
			lm = int(math.floor(math.sqrt(n)))
			for i in range(2, lm + 1):
				if n % i == 0:
					return False
			return True

		def odd(n):
			t = n
			n = n // 10
			mul = 1
			new = 0
			while n:
				new = new * 10 + n % 10
				mul = mul * 10
				n = n // 10
			return t * mul + new

		def even(n):
			t = n
			mul = 1
			new = 0
			while n:
				new = new * 10 + n % 10
				mul = mul * 10
				n = n // 10
			return t * mul + new
		o = 1
		e = 1
		while True:
			opal = odd(o)
			epal = even(e)
			if opal < epal:
				if opal >= N and isPrime(opal):
					return opal
				o += 1
			else:
				if epal >= N and isPrime(epal):
					return epal
				e += 1


class Solution:

	def primePalindrome(self, N: int) -> int:

		@lru_cache(None)
		def isPrime(n):
			if n == 1:
				return False
			for i in range(2, int(sqrt(n)) + 1):
				if isPrime(i):
					if n % i == 0:
						return False
			return True

		def isPalindrome(n):
			return n == int(str(n)[::-1])
		while True:
			if isPalindrome(N) and isPrime(N):
				return N
			N += 1
			length = len(str(N))
			if length > 2 and length % 2 == 0:
				N = int('1' + '0' * (length - 1) + '1')
		return None


def isPrimes(n):
	return n > 1 and all((n % d > 0 for d in range(2, int(sqrt(n)) + 1)))

def reverse(x):
	return int(str(x)[::-1])

class Solution:

	def primePalindrome(self, N: int) -> int:
		if N >= 9989900:
			return 100030001
		while True:
			if N == reverse(N) and isPrimes(N):
				return N
			N += 1


class Solution:

	def is_prime(self, n):
		small_primes = (2, 3, 5, 7, 11, 13, 17, 19)
		if n == 1:
			return False
		if n in small_primes:
			return True
		for p in small_primes:
			if n % p == 0:
				return False
		check_limit = int(n ** 0.5) + 1
		for p in range(small_primes[-1], check_limit, 2):
			if n % p == 0:
				return False
		return True

	def is_odd_len_palindrome(self, n):
		n_str = str(n)
		total_digit = len(n_str)
		len_is_odd = total_digit % 2 != 0
		if not len_is_odd:
			return False
		half_len_n = int((total_digit + 1) / 2)
		if n_str[:half_len_n] != n_str[total_digit - half_len_n:][::-1]:
			return False
		return True

	def find_odd_len_palindrome_after_n(self, n):
		if n < 9:
			return n + 1
		elif n < 11:
			return 11
		n_str = str(n)
		total_digit = len(n_str)
		len_is_odd = total_digit % 2 != 0
		if not len_is_odd:
			return int('1' + '0' * (total_digit - 1) + '1')
		half_len_n = int((total_digit + 1) / 2)
		left_str = n_str[:half_len_n]
		right_str = left_str[:total_digit - half_len_n][::-1]
		p = int(left_str + right_str)
		if p > n:
			return p
		else:
			left = int(left_str)
			left += 1
			increase_digit = len(str(left)) > len(left_str)
			left_str = str(left)
			if increase_digit:
				return int('1' + '0' * total_digit + '1')
			left_str = left_str[:half_len_n]
			right_str = left_str[:total_digit - half_len_n][::-1]
			return int(left_str + right_str)

	def primePalindrome(self, N: int) -> int:
		if self.is_odd_len_palindrome(N) and self.is_prime(N):
			return N
		elif N == 11:
			return N
		i = self.find_odd_len_palindrome_after_n(N)
		while i < 2 * 10 ** 8:
			if self.is_prime(i):
				return i
			i = self.find_odd_len_palindrome_after_n(i)
		return i


class Solution:

	def primePalindrome(self, N: int) -> int:

		def is_prime(num):
			return num > 1 and all((num % d for d in range(2, int(num ** 0.5) + 1)))
		while True:
			if str(N) == str(N)[::-1] and is_prime(N):
				return N
			N += 1
			if 10 ** 7 < N < 10 ** 8:
				N = 10 ** 8


class Solution:

	def primePalindrome(self, N: int) -> int:

		def isPrime(num):
			if num == 1:
				return False
			for div in range(2, int(num ** 0.5) + 1):
				if num % div == 0:
					return False
			return True

		def isPalindrome(num):
			num = str(num)
			left = 0
			right = len(num) - 1
			while left < right:
				if num[left] != num[right]:
					return False
				left += 1
				right -= 1
			return True
		while True:
			if isPalindrome(N) and isPrime(N):
				break
			N += 1
			if 10 ** 7 < N < 10 ** 8:
				N = 10 ** 8
		return N


class Solution:

	def primePalindrome(self, N: int) -> int:
		for i in range(N, 10 ** 7 + 1):
			if not self.isPalindrome(i):
				continue
			if not self.isPrime(i):
				continue
			return i
		for i in range(10 ** 8, 2 * 10 ** 8):
			if not self.isPalindrome(i):
				continue
			if not self.isPrime(i):
				continue
			return i

	def isPalindrome(self, i):
		i = str(i)
		return i == i[::-1]

	def isPrime(self, i):
		return i > 1 and all([i % d != 0 for d in range(2, int(sqrt(i)) + 1)])


class Solution:

	def primePalindrome(self, N: int) -> int:
		if N == 1:
			return 2

		def isPrime(num):
			for i in range(2, int(num ** 0.5) + 1):
				if num % i == 0:
					return False
			return True
		while str(N) != str(N)[::-1] or not isPrime(N):
			N += 1
			if 10 ** 7 < N < 10 ** 8:
				N = 10 ** 8
		return N


class Solution:

	def primePalindrome(self, N: int) -> int:

		def isPrime(x):
			return x > 1 and all((x % d for d in range(2, int(x ** 0.5) + 1)))

		def isPalindrome(x):
			x = str(x)
			if len(x) == 1:
				return True
			i = 0
			j = len(x) - 1
			while i < j:
				if x[i] == x[j]:
					i += 1
					j -= 1
				else:
					return False
			return True
		if N <= 1:
			return 2
		i = N
		while True:
			if str(i) == str(i)[::-1] and isPrime(i):
				return i
			i += 1
			if 10 ** 7 < i < 10 ** 8:
				i = 10 ** 8
		return -1


class Solution:

	def primePalindrome(self, N: int) -> int:

		def reverse(n):
			return int(str(n)[::-1])

		def isPrime(n):
			return n > 1 and all((n % d for d in range(2, int(n ** 0.5) + 1)))
		while True:
			if N == reverse(N) and isPrime(N):
				return N
			N += 1
			if 10 ** 7 < N < 10 ** 8:
				N = 10 ** 8


class Solution:

	def primePalindrome(self, N: int) -> int:

		def isprime(N):
			if N <= 1:
				return False
			n = 2
			while n <= N ** 0.5:
				if N % n == 0:
					return False
				n += 1
			return True

		def ispali(N):
			s = str(N)
			(i, j) = (0, len(s) - 1)
			while i <= j:
				if s[i] != s[j]:
					return False
				i += 1
				j -= 1
			return True
		while 1:
			if ispali(N):
				if isprime(N):
					return N
			N += 1
			if 10 ** 7 < N < 10 ** 8:
				N = 10 ** 8


class Solution:

	def primePalindrome(self, N: int) -> int:

		def ispad(n):
			n = str(n)
			n = list(n)
			(left, right) = (0, len(n) - 1)
			while left < right:
				if n[left] != n[right]:
					return False
				left += 1
				right -= 1
			return True

		def isprime(n):
			for i in range(2, int(n ** 0.5) + 1):
				if n % i == 0:
					return False
			return True
		if N == 1:
			return 2
		while True:
			if ispad(N) and isprime(N):
				return N
			N += 1
			if 10 ** 7 < N < 10 ** 8:
				N = 10 ** 8


class Solution:

	def primePalindrome(self, N: int) -> int:
		i = N
		while True:
			if self.isPalindrome(str(i)):
				if self.isPrime(i):
					return i
			i += 1
			if 10 ** 7 < i < 10 ** 8:
				i = 10 ** 8

	def isPalindrome(self, s):
		for i in range(0, len(s) // 2):
			if s[i] != s[len(s) - 1 - i]:
				return False
		return True

	def isPrime(self, n):
		if n < 2 or len(str(n)) == 8:
			return False
		upper = int(sqrt(n))
		for i in range(2, upper + 1):
			if n % i == 0:
				return False
		return True


class Solution:

	def primePalindrome(self, N: int) -> int:

		def isPrime(x):
			if x == 1:
				return False
			for i in range(2, int(x ** 0.5) + 1):
				if x % i == 0:
					return False
			return True

		def isPalindrome(x):
			x = str(x)
			l = [ch for ch in x]
			return l[::-1] == l
		while True:
			if isPalindrome(N) and isPrime(N):
				break
			N += 1
			if 10 ** 7 < N < 10 ** 8:
				N = 10 ** 8
		return N


class Solution(object):

	def primePalindrome(self, N):

		def is_prime(n):
			return n > 1 and all((n % d for d in range(2, int(n ** 0.5) + 1)))

		def reverse(x):
			ans = 0
			while x:
				ans = 10 * ans + x % 10
				x //= 10
			return ans
		while True:
			if N == reverse(N) and is_prime(N):
				return N
			N += 1
			if 10 ** 7 < N < 10 ** 8:
				N = 10 ** 8


def isPrimes(n):
	return n > 1 and all((n % d > 0 for d in range(2, int(sqrt(n)) + 1)))

def reverse(x):
	ans = 0
	while x:
		ans = 10 * ans + x % 10
		x //= 10
	return ans

class Solution:

	def primePalindrome(self, N: int) -> int:
		while True:
			if N == reverse(N) and isPrimes(N):
				return N
			N += 1
			if 10 ** 7 < N < 10 ** 8:
				N = 10 ** 8


class Solution:

	def primePalindrome(self, N: int) -> int:

		def isPrime(N):
			return N > 1 and all((N % d for d in range(2, int(N ** 0.5) + 1)))

		def nextPalindrome(N):
			if N in [999, 99999, 9999999]:
				return (N + 1) * 10 + 1
			n = str(N // 10 ** (len(str(N)) // 2) + 1)
			return int(n + n[-2::-1])
		if N <= 11:
			while not isPrime(N):
				N += 1
			return N
		if (digits := len(str(N))) % 2 == 0:
			N = 10 ** digits + 1
		else:
			n = str(N // 10 ** (len(str(N)) // 2))
			if (p := int(n + n[-2::-1])) >= N:
				N = p
			else:
				N = nextPalindrome(p)
		while not isPrime(N):
			N = nextPalindrome(N)
		return N


class Solution:

	def primePalindrome(self, N: int) -> int:

		def reverse(n):
			sm = 0
			while n > 0:
				r = n % 10
				sm = sm * 10 + r
				n = n // 10
			return sm

		def isprime(n):
			for i in range(2, int(n ** 0.5) + 1):
				if n % i == 0:
					return False
			return True
		if N == 1:
			return 2
		while True:
			if N == reverse(N) and isprime(N):
				return N
			N += 1
			if 10 ** 7 < N < 10 ** 8:
				N = 10 ** 8


class Solution:

	def primePalindrome(self, N: int) -> int:

		def reverse(n):
			a = 0
			while n > 0:
				r = n % 10
				a = a * 10 + r
				n = n // 10
			return a

		def snt(n):
			for i in range(2, int(sqrt(n)) + 1):
				if n % i == 0:
					return False
			return True
		if N == 1:
			return 2
		while True:
			if N == reverse(N) and snt(N):
				return N
			N += 1
			if 10 ** 7 < N < 10 ** 8:
				N = 10 ** 8


class Solution:

	def primePalindrome(self, N: int) -> int:

		def isPrime(num):
			if num < 2 or num % 2 == 0:
				return num == 2
			s_num = int(num ** 0.5)
			for i in range(3, s_num + 1):
				if num % i == 0:
					return False
			return True
		if N >= 8 and N <= 11:
			return 11
		for i in range(10 ** (len(str(N)) // 2), 10 ** 5):
			s = str(i)
			s2 = s + s[::-1][1:]
			if isPrime(int(s2)) and int(s2) >= N:
				return int(s2)
		return N


from math import sqrt

class Solution:

	def primePalindrome(self, N: int) -> int:

		def subgen(start, upper, odd):
			start = int(start)
			for i in range(start, upper):
				if odd:
					yield int(str(i) + str(i)[:-1][::-1])
				else:
					yield int(str(i) + str(i)[::-1])

		def is_prime(n):
			factors = []
			for i in range(1, int(sqrt(n)) + 1):
				if n % i == 0:
					factors.extend([i, n // i])
					if len(factors) > 2:
						return False
			return len(factors) <= 2

		def generator(N):
			if N <= 10:
				for i in range(2, 10):
					if is_prime(i):
						yield i
			if N <= 11:
				yield 11
			if N <= 1000:
				for i in subgen('10', 100, True):
					if is_prime(i):
						yield i
			if N <= 10000:
				for i in subgen('10', 100, False):
					if is_prime(i):
						yield i
			if N <= 100000:
				for i in subgen('100', 1000, True):
					if is_prime(i):
						yield i
			if N <= 1000000:
				for i in subgen('100', 1000, False):
					if is_prime(i):
						yield i
			if N <= 10000000:
				for i in subgen('1000', 10000, True):
					if is_prime(i):
						yield i
			if N <= 100000000:
				for i in subgen('1000', 10000, False):
					if is_prime(i):
						yield i
			if N <= 1000000000:
				for i in subgen('10000', 20000, True):
					if is_prime(i):
						yield i
		for g in generator(N):
			if g >= N:
				return g


class Solution:

	def primePalindrome(self, N: int) -> int:

		def prime(n):
			if n == 1:
				return False
			for i in range(2, int(n ** 0.5) + 1):
				if n % i == 0:
					return False
			return True

		def reverse(N):
			res = 0
			d = N
			while N > 0:
				res = 10 * res + N % 10
				N = int(N / 10)
			return res
		while 1:
			if N == reverse(N) and prime(N):
				return N
			N += 1
			if 10 ** 7 < N < 10 ** 8:
				N = 10 ** 8


class Solution:

	def check_prime(self, N):
		m = int(math.sqrt(N))
		for i in range(2, m + 1):
			if N % i == 0:
				return 0
		return 1

	def reverse_string(self, s):
		n = len(s)
		t = [s[n - i] for i in range(1, n + 1)]
		t = ''.join(t)
		return t

	def rev(self, l, parity):
		l = [str(s) for s in l]
		if parity == 0:
			l = [s + self.reverse_string(s) for s in l]
		if parity == 1:
			l = [s[:-1] + s[-1] + self.reverse_string(s[:-1]) for s in l]
		return l

	def gen_palin(self, k):
		m = k // 2
		parity = k % 2
		if k % 2 == 0:
			l = list(range(10 ** (m - 1), 10 ** m))
		if k % 2 == 1:
			l = list(range(10 ** m, 10 ** (m + 1)))
		l = self.rev(l, parity)
		l = [int(x) for x in l]
		l.sort()
		return l

	def primePalindrome(self, N):
		if N == 1:
			return 2
		s = str(N)
		k = len(s)
		current = k
		x = 1
		while x:
			l = self.gen_palin(k)
			for a in l:
				if a >= N:
					if self.check_prime(a):
						return a
			k += 1


def isPrime(val):
	if val == 1:
		return False
	if val == 2:
		return True
	if val % 2 == 0:
		return False
	for i in range(3, floor(sqrt(val)) + 2, 2):
		if val % i == 0:
			return False
	return True

class Solution:

	def primePalindrome(self, N: int) -> int:
		if N >= 8 and N <= 11:
			return 11
		mn = 1000000000.0
		print(isPrime(N))
		for i in range(1, 10009):
			s = str(i)
			r = s[::-1]
			r = r[1:]
			t = int(s + r)
			if t >= N and isPrime(t):
				mn = min(mn, t)
		return mn