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 | 191 |
| 6 | 373 |
| 7 | 13931 |
| 8 | 757 |
| 9 | 797 |
| 10 | 19991 |
| 11 | 77377 |
| 12 | 77977 |
| 13 | 79997 |
| 14 | 1987891 |
| 15 | 3799973 |
| 16 | 7977797 |
| 17 | 9889889 |
| 18 | 9989899 |
| 19 | 769797967 |
| 20 | 797898797 |
| 21 | 779999977 |
| 22 | 37898989873 |
| 23 | 39988988993 |
| 24 | 78899799887 |
| 25 | 99998989999 |
| 26 | 3799999999973 |
| 27 | 3998999998993 |