This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 101 |
| 6 | 181 |
| 7 | 383 |
| 8 | 727 |
| 9 | 787 |
| 10 | 929 |
| 11 | 10301 |
| 12 | 10501 |
| 13 | 14341 |
| 14 | 16361 |
| 15 | 16561 |
| 16 | 18181 |
| 17 | 30103 |
| 18 | 30703 |
| 19 | 32323 |
| 20 | 36563 |
| 21 | 38183 |
| 22 | 38783 |
| 23 | 70507 |
| 24 | 72727 |
| 25 | 74747 |
| 26 | 78787 |
| 27 | 90709 |
| 28 | 94949 |
| 29 | 96769 |
| 30 | 1074701 |
| 31 | 1092901 |
| 32 | 1212121 |
| 33 | 1218121 |
| 34 | 1412141 |
| 35 | 1616161 |
| 36 | 1658561 |
| 37 | 1856581 |
| 38 | 1878781 |
| 39 | 3072703 |