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 | 5 |
| 2 | 35 |
| 3 | 57 |
| 4 | 355 |
| 5 | 359 |
| 6 | 557 |
| 7 | 579 |
| 8 | 3335 |
| 9 | 3357 |
| 10 | 5579 |
| 11 | 5777 |
| 12 | 33557 |
| 13 | 35559 |
| 14 | 333555 |
| 15 | 357799 |
| 16 | 557779 |
| 17 | 3335779 |
| 18 | 3355777 |
| 19 | 33333577 |