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 | 47 |
| 3 | 67 |
| 4 | 467 |
| 5 | 487 |
| 6 | 647 |
| 7 | 677 |
| 8 | 787 |
| 9 | 877 |
| 10 | 887 |
| 11 | 4447 |
| 12 | 4787 |
| 13 | 4877 |
| 14 | 7477 |
| 15 | 7487 |
| 16 | 7687 |
| 17 | 7867 |
| 18 | 7877 |
| 19 | 8447 |
| 20 | 8467 |
| 21 | 8647 |
| 22 | 8677 |
| 23 | 8747 |
| 24 | 8867 |
| 25 | 8887 |
| 26 | 44647 |
| 27 | 44687 |
| 28 | 44777 |
| 29 | 44867 |
| 30 | 44887 |
| 31 | 46447 |
| 32 | 46477 |
| 33 | 46687 |
| 34 | 46747 |
| 35 | 46867 |
| 36 | 46877 |
| 37 | 47777 |
| 38 | 48487 |
| 39 | 48647 |
| 40 | 48677 |
| 41 | 48767 |
| 42 | 48787 |
| 43 | 48847 |