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 | 1 |
| 2 | 7 |
| 3 | 31 |
| 4 | 91 |
| 5 | 97 |
| 6 | 291 |
| 7 | 331 |
| 8 | 391 |
| 9 | 397 |
| 10 | 931 |
| 11 | 2331 |
| 12 | 3331 |
| 13 | 3391 |
| 14 | 3931 |
| 15 | 5331 |
| 16 | 7331 |
| 17 | 7397 |
| 18 | 8397 |
| 19 | 9291 |
| 20 | 9331 |
| 21 | 23331 |
| 22 | 27397 |
| 23 | 32331 |
| 24 | 33391 |
| 25 | 33931 |
| 26 | 39291 |
| 27 | 39331 |
| 28 | 43331 |
| 29 | 48397 |
| 30 | 59291 |
| 31 | 68397 |
| 32 | 69291 |
| 33 | 93331 |
| 34 | 127397 |
| 35 | 159291 |
| 36 | 427397 |
| 37 | 439291 |
| 38 | 459291 |
| 39 | 469291 |
| 40 | 623331 |
| 41 | 632331 |