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 | 5 |
| 3 | 7 |
| 4 | 47 |
| 5 | 227 |
| 6 | 257 |
| 7 | 277 |
| 8 | 457 |
| 9 | 547 |
| 10 | 557 |
| 11 | 577 |
| 12 | 727 |
| 13 | 757 |
| 14 | 2447 |
| 15 | 2477 |
| 16 | 2557 |
| 17 | 2777 |
| 18 | 4447 |
| 19 | 4457 |
| 20 | 4547 |
| 21 | 5227 |
| 22 | 5477 |
| 23 | 5527 |
| 24 | 5557 |
| 25 | 7247 |
| 26 | 7457 |
| 27 | 7477 |
| 28 | 7547 |
| 29 | 7577 |
| 30 | 7727 |
| 31 | 7757 |
| 32 | 22247 |
| 33 | 22277 |
| 34 | 22447 |
| 35 | 22727 |
| 36 | 22777 |
| 37 | 24247 |
| 38 | 24527 |
| 39 | 24547 |
| 40 | 25247 |
| 41 | 25447 |
| 42 | 25457 |
| 43 | 25577 |
| 44 | 25747 |
| 45 | 27277 |