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) |
|---|---|
| 0 | 2 |
| 1 | 3 |
| 2 | 23 |
| 3 | 223 |
| 4 | 2237 |
| 5 | 22229 |
| 6 | 222247 |
| 7 | 2222239 |
| 8 | 22222223 |
| 9 | 222222227 |
| 10 | 2222222243 |
| 11 | 22222222223 |
| 12 | 222222222301 |
| 13 | 2222222222243 |
| 14 | 22222222222229 |
| 15 | 222222222222227 |
| 16 | 2222222222222281 |
| 17 | 22222222222222301 |
| 18 | 222222222222222281 |