#include <iostream>
#include <string>
#include <vector>
#include <utility>
#include <map>
#include <algorithm>

using namespace std;

int prime2017[] = { // {{{
	3, 5, 13, 37, 61, 73, 157, 193, 277, 313, 397, 421, 457, 541, 613,
	661, 673, 733, 757, 877, 997, 1093, 1153, 1201, 1213, 1237, 1321,
	1381, 1453, 1621, 1657, 1753, 1873, 1933, 1993, 2017, 2137, 2341,
	2473, 2557, 2593, 2797, 2857, 2917, 3061, 3217, 3253, 3313, 3517,
	3733, 4021, 4057, 4177, 4261, 4273, 4357, 4441, 4561, 4621, 4933,
	5077, 5101, 5113, 5233, 5413, 5437, 5581, 5701, 6037, 6073, 6121,
	6133, 6217, 6337, 6361, 6373, 6637, 6661, 6781, 6997, 7057, 7213,
	7393, 7417, 7477, 7537, 7753, 7933, 8053, 8101, 8221, 8317, 8353,
	8461, 8521, 8677, 8713, 8893, 9013, 9133, 9181, 9241, 9277, 9601,
	9661, 9721, 9817, 9901, 9973, 10333, 10357, 10453, 10837, 10861,
	10957, 11113, 11161, 11317, 11497, 11677, 11701, 12073, 12157, 12241,
	12301, 12421, 12433, 12457, 12541, 12553, 12601, 12721, 12757, 12841,
	12853, 13093, 13381, 13417, 13681, 13921, 13933, 14437, 14593, 14737,
	14821, 15013, 15073, 15121, 15241, 15277, 15361, 15373, 15733, 15901,
	16033, 16333, 16381, 16417, 16573, 16633, 16657, 16921, 17041, 17053,
	17077, 17257, 17293, 17377, 17881, 18013, 18097, 18133, 18181, 18217,
	18253, 18301, 18313, 18397, 18481, 18553, 18637, 18793, 19237, 19441,
	19477, 19717, 19801, 19813, 19861, 20353, 20533, 20641, 20857, 21001,
	21061, 21193, 21277, 21313, 21577, 21661, 21673, 21817, 22093, 22501,
	22573, 22621, 22993, 23053, 23173, 23557, 23677, 23773, 23917, 24097,
	24421, 24481, 24781, 24841, 25033, 25153, 25237, 25561, 25657, 25933,
	26017, 26293, 26317, 26437, 26497, 26821, 26833, 26881, 26953, 27073,
	27253, 27337, 27361, 27457, 27997, 28057, 28297, 28393, 28813, 28837,
	28921, 29101, 29473, 29641, 30181, 30241, 30517, 30553, 30577, 30637,
	30661, 30697, 30781, 30853, 31081, 31237, 31321, 31333, 31357, 31477,
	31573, 31873, 31981, 32173, 32377, 32497, 32533, 32833, 33037, 33301,
	33457, 33493, 33757, 33961, 34057, 34213, 34273, 34381, 34513, 34897,
	34981, 35317, 35521, 35677, 35977, 36097, 36241, 36433, 36457, 36793,
	36877, 36901, 36913, 37273, 37321, 37357, 37573, 37717, 37957, 38281,
	38461, 38833, 38953, 38977, 39217, 39373, 39397, 39733, 40093, 40177,
	40213, 40693, 40813, 41017, 41221, 41281, 41413, 41617, 41893, 42061,
	42337, 42373, 42793, 42961, 43117, 43177, 43201, 43321, 43573, 43597,
	43633, 43717, 44053, 44101, 44221, 44257, 44293, 44893, 45061, 45337,
	45433, 45481, 45553, 45613, 45841, 46021, 46141, 46261, 46861, 46993,
	47017, 47161, 47353, 47521, 47533, 47653, 47713, 47737, 47797, 47857,
	48121, 48193, 48337, 48673, 48757, 48781, 49033, 49261, 49393, 49417,
	49597, 49681, 49957, 50221, 50341, 50377, 50821, 50893, 51157, 51217,
	51241, 51481, 51517, 51637, 52057, 52081, 52237, 52321, 52453, 52501,
	52813, 52861, 52957, 53077, 53113, 53281, 53401, 53917, 54121, 54133,
	54181, 54217, 54421, 54517, 54541, 54673, 54721, 54973, 55057, 55381,
	55501, 55633, 55837, 55921, 55933, 56053, 56101, 56113, 56197, 56401,
	56437, 56701, 56773, 56821, 56857, 56893, 57073, 57097, 57193, 57241,
	57373, 57457, 57853, 58153, 58417, 58441, 58537, 58573, 58693, 59053,
	59197, 59221, 59281, 59341, 59833, 60217, 60337, 60373, 60637, 60733,
	60937, 61057, 61153, 61261, 61297, 61561, 61657, 61681, 61717, 61861,
	62137, 62473, 62497, 62533, 62653, 62773, 63313, 63397, 63541, 63697,
	63781, 63913, 64153, 64237, 64381, 64513, 64717, 65173, 65293, 65413,
	65437, 65497, 65557, 65677, 65881, 66301, 66361, 66601, 66697, 66853,
	66973, 67057, 67153, 67273, 67477, 67537, 67741, 67777, 67933, 67993,
	68113, 68281, 68521, 68737, 69001, 69073, 69457, 69493, 69697, 69877,
	70117, 70177, 70297, 70501, 70621, 70921, 70981, 71233, 71341, 71353,
	71593, 71821, 72073, 72481, 72613, 72901, 72937, 73141, 73417, 73477,
	73561, 73693, 74077, 74317, 74377, 74713, 75013, 75133, 75181, 75721,
	75793, 75913, 76333, 76561, 76597, 76753, 77137, 77641, 78157, 78193,
	78277, 78877, 78901, 79333, 79357, 79537, 79657, 79693, 79801, 79873,
	80077, 80173, 80221, 80473, 80701, 80713, 80917, 81013, 81181, 81517,
	81637, 81853, 82021, 82153, 82261, 82561, 82981, 83077, 83221, 83233,
	83437, 83617, 83701, 83773, 84121, 84313, 84673, 84697, 84793, 84913,
	85297, 85333, 85453, 85717, 85933, 86353, 86413, 87181, 87253, 87337,
	87421, 87433, 87517, 87553, 87973, 88117, 88177, 88237, 88261, 88513,
	88741, 88897, 88993, 89293, 89833, 89917, 90121, 91081, 91381, 91393,
	91513, 91957, 92041, 92557, 92761, 92821, 92893, 92941, 93097, 93133,
	93493, 93637, 93913, 94033, 94117, 94273, 94321, 94441, 94573, 94777,
	94837, 94993, 95257, 95317, 95401, 95581, 95617, 95713, 95737, 96097,
	96157, 96181, 96493, 96517, 96973, 97081, 97177, 97501, 97561, 97777,
	97813, 98017, 98737, 98953, 99277, 99577, 99661, 99877,
}; // }}}

vector<int> build(int n)
{
  vector<int> numbers(n + 1, 0);
  size_t size = sizeof(prime2017) / sizeof(int);

  int ni = numbers.size();
  for (size_t pi = size; pi != 0;) {
    --pi;
    for (; ni >= prime2017[pi]; --ni) {
      numbers[ni] = pi + 1;
    }
  }

  return numbers;
}

int main()
{
  auto numbers = build(100001);
  int Q;
  cin >> Q;
  for (int q = 0; q < Q; ++q) {
    int l, r;
    cin >> l >> r;
    cout << numbers[r] - numbers[l - 1] << endl;
  }
  return 0;
}

Measured memory_bytes: 1024