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 | 79997 |
| 2 | 79999 |
| 3 | 777977 |
| 4 | 777979 |
| 5 | 7977797 |
| 6 | 7977799 |
| 7 | 77997779 |
| 8 | 77997977 |
| 9 | 77997979 |
| 10 | 99777779 |
| 11 | 799999799 |
| 12 | 977797979 |
| 13 | 977999777 |
| 14 | 977999779 |
| 15 | 979797779 |
| 16 | 999799979 |
| 17 | 7777997999 |
| 18 | 7797799979 |
| 19 | 7979997797 |
| 20 | 7979997799 |
| 21 | 7999777997 |
| 22 | 7999777999 |
| 23 | 7999797977 |
| 24 | 7999797979 |