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 | 19 |
| 7 | 41 |
| 8 | 61 |
| 9 | 89 |
| 10 | 409 |
| 11 | 449 |
| 12 | 499 |
| 13 | 881 |
| 14 | 991 |
| 15 | 6469 |
| 16 | 6949 |
| 17 | 9001 |
| 18 | 9049 |
| 19 | 9649 |
| 20 | 9949 |
| 21 | 60649 |
| 22 | 666649 |
| 23 | 946669 |
| 24 | 60000049 |
| 25 | 66000049 |
| 26 | 66600049 |