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 | 113 |
| 2 | 131 |
| 3 | 223 |
| 4 | 229 |
| 5 | 233 |
| 6 | 311 |
| 7 | 313 |
| 8 | 331 |
| 9 | 337 |
| 10 | 353 |
| 11 | 373 |
| 12 | 383 |
| 13 | 433 |
| 14 | 443 |
| 15 | 599 |
| 16 | 677 |
| 17 | 733 |
| 18 | 773 |
| 19 | 797 |
| 20 | 883 |
| 21 | 929 |
| 22 | 977 |
| 23 | 997 |
| 24 | 2333 |
| 25 | 3331 |
| 26 | 3313 |
| 27 | 3373 |
| 28 | 3433 |
| 29 | 3533 |
| 30 | 3733 |
| 31 | 3833 |
| 32 | 7333 |
| 33 | 9929 |
| 34 | 23333 |
| 35 | 33331 |
| 36 | 33533 |
| 37 | 38333 |
| 38 | 99929 |
| 39 | 323333 |
| 40 | 333331 |
| 41 | 333533 |
| 42 | 3233333 |
| 43 | 3333313 |
| 44 | 3333331 |
| 45 | 32333333 |
| 46 | 33333133 |
| 47 | 33333331 |
| 48 | 333331333 |
| 49 | 333333313 |