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 | 3 |
| 2 | 5 |
| 3 | 257 |
| 4 | 2237 |
| 5 | 2377 |
| 6 | 2557 |
| 7 | 5557 |
| 8 | 33353 |
| 9 | 33377 |
| 10 | 73237 |
| 11 | 252233 |
| 12 | 252253 |
| 13 | 253573 |
| 14 | 3533377 |
| 15 | 3533533 |
| 16 | 3555557 |
| 17 | 3577333 |
| 18 | 5375327 |
| 19 | 5375533 |
| 20 | 7725733 |
| 21 | 7737557 |
| 22 | 7777337 |
| 23 | 37237523 |
| 24 | 37237573 |
| 25 | 37237723 |
| 26 | 37273237 |
| 27 | 37273337 |
| 28 | 55775227 |
| 29 | 527522777 |
| 30 | 527523223 |
| 31 | 527532553 |