多角数
数表

| 名前 | 一般式 | n = 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | オンライン整数列大辞典 | リスト |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |

| 三角数 | (n2 + n)/2 | 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36 | 45 | 55 | 66 | 78 | 91 | A000217 | Table of n. a(n) for n = 0.. |
| 四角数 | n2 | 1 | 4 | 9 | 16 | 25 | 36 | 49 | 64 | 81 | 100 | 121 | 144 | 169 | A000290 | Table of n, a(n) for n = 0.. |
| 五角数 | (3n2 − n)/2 | 1 | 5 | 12 | 22 | 35 | 51 | 70 | 92 | 117 | 145 | 176 | 210 | 247 | A000326 | Table of n, a(n) for n = 0.. |
| 六角数 | 2n2 − n | 1 | 6 | 15 | 28 | 45 | 66 | 91 | 120 | 153 | 190 | 231 | 276 | 325 | A000384 | Table of n, a(n) for n = 0.. |
| 七角数 | (5n2 − 3n)/2 | 1 | 7 | 18 | 34 | 55 | 81 | 112 | 148 | 189 | 235 | 286 | 342 | 403 | A000566 | Table of n, a(n) for n = 0.. |
| 八角数 | 3n2 − 2n | 1 | 8 | 21 | 40 | 65 | 96 | 133 | 176 | 225 | 280 | 341 | 408 | 481 | A000567 | Table of n, a(n) for n = 0.. |
| 九角数 | (7n2 − 5n)/2 | 1 | 9 | 24 | 46 | 75 | 111 | 154 | 204 | 261 | 325 | 396 | 474 | 559 | A001106 | Table of n, a(n) for n = 0.. |
| 十角数 | 4n2 − 3n | 1 | 10 | 27 | 52 | 85 | 126 | 175 | 232 | 297 | 370 | 451 | 540 | 637 | A001107 | Table of n, a(n) for n = 0.. |
| 十一角数 | (9n2 − 7n)/2 | 1 | 11 | 30 | 58 | 95 | 141 | 196 | 260 | 333 | 415 | 506 | 606 | 715 | A051682 | Table of n, a(n) for n = 0.. |
| 十二角数 | 5n2 − 4n | 1 | 12 | 33 | 64 | 105 | 156 | 217 | 288 | 369 | 460 | 561 | 672 | 793 | A051624 | Table of n, a(n) for n = 0.. |
| 十三角数 | (11n2 − 9n)/2 | 1 | 13 | 36 | 70 | 115 | 171 | 238 | 316 | 405 | 505 | 616 | 738 | 871 | A051865 | Table of n, a(n) for n = 0.. |
| 十四角数 | 6n2 − 5n | 1 | 14 | 39 | 76 | 125 | 186 | 259 | 344 | 441 | 550 | 671 | 804 | 949 | A051866 | Table of n, a(n) for n = 0.. |
| 十五角数 | (13n2 − 11n)/2 | 1 | 15 | 42 | 82 | 135 | 201 | 280 | 372 | 477 | 595 | 726 | 870 | 1027 | A051867 | Table of n, a(n) for n = 0.. |
| 十六角数 | 7n2 − 6n | 1 | 16 | 45 | 88 | 145 | 216 | 301 | 400 | 513 | 640 | 781 | 936 | 1105 | A051868 | Table of n, a(n) for n = 0.. |
| 十七角数 | (15n2 − 13n)/2 | 1 | 17 | 48 | 94 | 155 | 231 | 322 | 428 | 549 | 685 | 836 | 1002 | 1183 | A051869 | Table of n, a(n) for n = 0.. |
| 十八角数 | 8n2 − 7n | 1 | 18 | 51 | 100 | 165 | 246 | 343 | 456 | 585 | 730 | 891 | 1068 | 1261 | A051870 | Table of n, a(n) for n = 0.. |
| 十九角数 | (17n2 − 15n)/2 | 1 | 19 | 54 | 106 | 175 | 261 | 364 | 484 | 621 | 775 | 946 | 1134 | 1339 | A051871 | Table of n, a(n) for n = 0.. |
| 二十角数 | 9n2 − 8n | 1 | 20 | 57 | 112 | 185 | 276 | 385 | 512 | 657 | 820 | 1001 | 1200 | 1417 | A051872 | Table of n, a(n) for n = 0.. |
| 二十一角数 | (19n2 − 17n)/2 | 1 | 21 | 60 | 118 | 195 | 291 | 406 | 540 | 693 | 865 | 1056 | 1266 | 1495 | A051873 | Table of n, a(n) for n = 0.. |
| 二十二角数 | 10n2 − 9n | 1 | 22 | 63 | 124 | 205 | 306 | 427 | 568 | 729 | 910 | 1111 | 1332 | 1573 | A051874 | Table of n, a(n) for n = 0.. |
| 二十三角数 | (21n2 − 19n)/2 | 1 | 23 | 66 | 130 | 215 | 321 | 448 | 596 | 765 | 955 | 1166 | 1398 | 1651 | A051875 | Table of n, a(n) for n = 0.. |
| 二十四角数 | 11n2 − 10n | 1 | 24 | 69 | 136 | 225 | 336 | 469 | 624 | 801 | 1000 | 1221 | 1464 | 1729 | A051876 | Table of n, a(n) for n = 0.. |
| 二十五角数 | (23n2 − 21n)/2 | 1 | 25 | 72 | 142 | 235 | 351 | 490 | 652 | 837 | 1045 | 1276 | 1530 | 1807 | A255184 | Table of n, a(n) for n = 0.. |
| 二十六角数 | 12n2 − 11n | 1 | 26 | 75 | 148 | 245 | 366 | 511 | 680 | 873 | 1090 | 1331 | 1596 | 1885 | A255185 | Table of n, a(n) for n = 0.. |
| 二十七角数 | (25n2 − 23n)/2 | 1 | 27 | 78 | 154 | 255 | 381 | 532 | 708 | 909 | 1135 | 1386 | 1662 | 1963 | A255186 | Table of n, a(n) for n = 0.. |
| 二十八角数 | 13n2 − 12n | 1 | 28 | 81 | 160 | 265 | 396 | 553 | 736 | 945 | 1180 | 1441 | 1728 | 2041 | A161935 | Table of n, a(n) for n = 0.. |
| 二十九角数 | (27n2 − 25n)/2 | 1 | 29 | 84 | 166 | 275 | 411 | 574 | 764 | 981 | 1225 | 1496 | 1794 | 2119 | A255187 | Table of n, a(n) for n = 0.. |
| 三十角数 | 14n2 − 13n | 1 | 30 | 87 | 172 | 285 | 426 | 595 | 792 | 1017 | 1270 | 1551 | 1860 | 2197 | A254474 | Table of n, a(n) for n = 0.. |