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 | 727 |
| 2 | 757 |
| 3 | 787 |
| 4 | 797 |
| 5 | 72227 |
| 6 | 75557 |
| 7 | 76667 |
| 8 | 78887 |
| 9 | 79997 |
| 10 | 7666667 |
| 11 | 722222227 |
| 12 | 74444444447 |
| 13 | 75555555557 |
| 14 | 755555555555555555557 |
| 15 | 75555555555555555555557 |
| 16 | 72222222222222222222222222227 |
| 17 | 79999999999999999999999999997 |
| 18 | 7444444444444444444444444444447 |