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 | 53 |
| 2 | 317 |
| 3 | 599 |
| 4 | 797 |
| 5 | 2393 |
| 6 | 3793 |
| 7 | 3797 |
| 8 | 7331 |
| 9 | 23333 |
| 10 | 23339 |
| 11 | 31193 |
| 12 | 31379 |
| 13 | 37397 |
| 14 | 73331 |
| 15 | 373393 |
| 16 | 593993 |
| 17 | 719333 |
| 18 | 739397 |
| 19 | 739399 |
| 20 | 2399333 |
| 21 | 7393931 |
| 22 | 7393933 |
| 23 | 23399339 |
| 24 | 29399999 |
| 25 | 37337999 |
| 26 | 59393339 |
| 27 | 73939133 |