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 | 555557 |
| 2 | 1555553 |
| 3 | 2555551 |
| 4 | 3555551 |
| 5 | 3555557 |
| 6 | 4555559 |
| 7 | 5055551 |
| 8 | 5055559 |
| 9 | 5355551 |
| 10 | 5505551 |
| 11 | 5535559 |
| 12 | 5550553 |
| 13 | 5550557 |
| 14 | 5554553 |
| 15 | 5555057 |
| 16 | 5555059 |
| 17 | 5555357 |
| 18 | 5555507 |
| 19 | 5555509 |
| 20 | 5555527 |
| 21 | 5555567 |
| 22 | 5555591 |
| 23 | 5555653 |
| 24 | 5556557 |
| 25 | 5556559 |
| 26 | 5557553 |