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 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 11 |
| 6 | 13 |
| 7 | 17 |
| 8 | 37 |
| 9 | 79 |
| 10 | 113 |
| 11 | 197 |
| 12 | 199 |
| 13 | 337 |
| 14 | 1193 |
| 15 | 3779 |
| 16 | 11939 |
| 17 | 19937 |
| 18 | 193939 |
| 19 | 199933 |
| 20 | 1111111111111111111 |
| 21 | 11111111111111111111111 |