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) |
|---|---|
| 0 | 131 |
| 1 | 313 |
| 2 | 353 |
| 3 | 757 |
| 4 | 797 |
| 5 | 35353 |
| 6 | 35753 |
| 7 | 75797 |
| 8 | 79757 |
| 9 | 97579 |
| 10 | 3131353 |
| 11 | 3135313 |
| 12 | 3531313 |
| 13 | 7535797 |
| 14 | 313131353 |
| 15 | 313135313 |
| 16 | 313579753 |
| 17 | 353535313 |
| 18 | 357531313 |
| 19 | 357531353 |
| 20 | 357535753 |
| 21 | 357575753 |
| 22 | 357975353 |
| 23 | 753535357 |
| 24 | 757975357 |
| 25 | 975353579 |