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 | 101 |
| 2 | 131 |
| 3 | 151 |
| 4 | 181 |
| 5 | 191 |
| 6 | 313 |
| 7 | 353 |
| 8 | 373 |
| 9 | 383 |
| 10 | 727 |
| 11 | 757 |
| 12 | 787 |
| 13 | 797 |
| 14 | 919 |
| 15 | 929 |
| 16 | 13331 |
| 17 | 15551 |
| 18 | 16661 |
| 19 | 19991 |
| 20 | 72227 |
| 21 | 75557 |
| 22 | 76667 |
| 23 | 78887 |
| 24 | 79997 |
| 25 | 1333331 |
| 26 | 1444441 |
| 27 | 1777771 |
| 28 | 3222223 |
| 29 | 3444443 |
| 30 | 7666667 |
| 31 | 9222229 |
| 32 | 9888889 |