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 | 5 |
| 2 | 7 |
| 3 | 29 |
| 4 | 31 |
| 5 | 179 |
| 6 | 181 |
| 7 | 1619 |
| 8 | 1621 |
| 9 | 21059 |
| 10 | 21061 |
| 11 | 463319 |
| 12 | 463321 |
| 13 | 11119679 |
| 14 | 11119681 |
| 15 | 567103679 |
| 16 | 567103681 |
| 17 | 52173538559 |
| 18 | 52173538561 |
| 19 | 6260824627199 |
| 20 | 6260824627201 |
| 21 | 1101905134387199 |
| 22 | 1101905134387201 |
| 23 | 284291524671897599 |
| 24 | 284291524671897601 |
| 25 | 77895877760099942399 |
| 26 | 77895877760099942401 |