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 | 1111151 |
| 2 | 1111181 |
| 3 | 1111211 |
| 4 | 1111711 |
| 5 | 1114111 |
| 6 | 1117111 |
| 7 | 1171111 |
| 8 | 2999999 |
| 9 | 3233333 |
| 10 | 3331333 |
| 11 | 3333133 |
| 12 | 3333233 |
| 13 | 3333313 |
| 14 | 3333331 |
| 15 | 3333373 |
| 16 | 3333383 |
| 17 | 3333433 |
| 18 | 3337333 |
| 19 | 3353333 |
| 20 | 3433333 |
| 21 | 3733333 |
| 22 | 4999999 |
| 23 | 7477777 |
| 24 | 7577777 |
| 25 | 7727777 |
| 26 | 7772777 |
| 27 | 7774777 |
| 28 | 7777727 |
| 29 | 7778777 |
| 30 | 7877777 |
| 31 | 9899999 |
| 32 | 9929999 |
| 33 | 9999299 |
| 34 | 9999929 |
| 35 | 9999991 |