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 | 7777 |
| 2 | 17777 |
| 3 | 27777 |
| 4 | 37777 |
| 5 | 47777 |
| 6 | 57777 |
| 7 | 67777 |
| 8 | 70777 |
| 9 | 71777 |
| 10 | 72777 |
| 11 | 73777 |
| 12 | 74777 |
| 13 | 75777 |
| 14 | 76777 |
| 15 | 77077 |
| 16 | 77177 |
| 17 | 77277 |
| 18 | 77377 |
| 19 | 77477 |
| 20 | 77577 |
| 21 | 77677 |
| 22 | 77707 |
| 23 | 77717 |
| 24 | 77727 |
| 25 | 77737 |
| 26 | 77747 |
| 27 | 77757 |
| 28 | 77767 |
| 29 | 77770 |
| 30 | 77771 |
| 31 | 77772 |