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 | 353 |
| 6 | 373 |
| 7 | 727 |
| 8 | 757 |
| 9 | 32323 |
| 10 | 33533 |
| 11 | 35353 |
| 12 | 35753 |
| 13 | 37273 |
| 14 | 37573 |
| 15 | 72227 |
| 16 | 72727 |
| 17 | 73237 |
| 18 | 75557 |
| 19 | 77377 |
| 20 | 3222223 |
| 21 | 3223223 |
| 22 | 3233323 |
| 23 | 3252523 |
| 24 | 3272723 |
| 25 | 3337333 |
| 26 | 3353533 |
| 27 | 3553553 |
| 28 | 3722273 |
| 29 | 3732373 |
| 30 | 3773773 |
| 31 | 7257527 |
| 32 | 7327237 |
| 33 | 7352537 |
| 34 | 7527257 |
| 35 | 7722277 |