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 | 138140141 |
| 2 | 180182183 |
| 3 | 240242243 |
| 4 | 250252253 |
| 5 | 330332333 |
| 6 | 400402403 |
| 7 | 408410411 |
| 8 | 478480481 |
| 9 | 546548549 |
| 10 | 570572573 |
| 11 | 600602603 |
| 12 | 646648649 |
| 13 | 660662663 |
| 14 | 676678679 |
| 15 | 768770771 |
| 16 | 838840841 |
| 17 | 876878879 |
| 18 | 928930931 |
| 19 | 940942943 |
| 20 | 970972973 |
| 21 | 996998999 |
| 22 | 100810101011 |
| 23 | 109610981099 |