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 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 11 |
| 6 | 353 |
| 7 | 727 |
| 8 | 919 |
| 9 | 30203 |
| 10 | 71917 |
| 11 | 3002003 |
| 12 | 7114117 |
| 13 | 9002009 |
| 14 | 111181111 |
| 15 | 300020003 |
| 16 | 711161117 |
| 17 | 900050009 |
| 18 | 11112721111 |
| 19 | 30000500003 |
| 20 | 71112121117 |
| 21 | 90005450009 |
| 22 | 1111118111111 |
| 23 | 3000002000003 |
| 24 | 7111144411117 |
| 25 | 9000005000009 |
| 26 | 111111181111111 |
| 27 | 300000020000003 |