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 | 7 |
| 2 | 79 |
| 3 | 97 |
| 4 | 797 |
| 5 | 977 |
| 6 | 997 |
| 7 | 77797 |
| 8 | 77977 |
| 9 | 77999 |
| 10 | 79777 |
| 11 | 79979 |
| 12 | 79997 |
| 13 | 79999 |
| 14 | 97777 |
| 15 | 777977 |
| 16 | 777979 |
| 17 | 779797 |
| 18 | 797977 |
| 19 | 799979 |
| 20 | 799999 |
| 21 | 999979 |
| 22 | 7777997 |
| 23 | 7779979 |
| 24 | 7779997 |
| 25 | 7797799 |
| 26 | 7797997 |
| 27 | 7799797 |
| 28 | 7799999 |
| 29 | 7977779 |
| 30 | 7977797 |
| 31 | 7977799 |
| 32 | 7977997 |