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 | 7 |
| 4 | 97 |
| 5 | 109 |
| 6 | 4441 |
| 7 | 111111109 |
| 8 | 555555555551 |
| 9 | 9999999999999937 |
| 10 | 111111111111111091 |
| 11 | 444444444444444419 |
| 12 | 555555555555555555491 |
| 13 | 777777777777777777777767 |
| 14 | 333333333333333333333333333333293 |
| 15 | 444444444444444444444444444444444391 |