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 | 331 |
| 2 | 661 |
| 3 | 881 |
| 4 | 991 |
| 5 | 18181 |
| 6 | 20201 |
| 7 | 21211 |
| 8 | 26261 |
| 9 | 27271 |
| 10 | 32321 |
| 11 | 33331 |
| 12 | 41411 |
| 13 | 48481 |
| 14 | 51511 |
| 15 | 54541 |
| 16 | 57571 |
| 17 | 60601 |
| 18 | 65651 |
| 19 | 69691 |
| 20 | 71711 |
| 21 | 78781 |
| 22 | 86861 |
| 23 | 89891 |
| 24 | 90901 |
| 25 | 92921 |
| 26 | 98981 |
| 27 | 99991 |
| 28 | 1041041 |
| 29 | 1051051 |
| 30 | 1131131 |
| 31 | 1191191 |
| 32 | 1201201 |
| 33 | 1221221 |
| 34 | 1231231 |
| 35 | 1261261 |
| 36 | 1281281 |