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 | 79 |
| 4 | 97 |
| 5 | 449 |
| 6 | 479 |
| 7 | 499 |
| 8 | 797 |
| 9 | 947 |
| 10 | 977 |
| 11 | 997 |
| 12 | 4447 |
| 13 | 4799 |
| 14 | 4999 |
| 15 | 7477 |
| 16 | 7499 |
| 17 | 7949 |
| 18 | 9479 |
| 19 | 9497 |
| 20 | 9749 |
| 21 | 9949 |
| 22 | 44449 |
| 23 | 44497 |
| 24 | 44777 |
| 25 | 44797 |
| 26 | 47497 |
| 27 | 47777 |
| 28 | 47779 |
| 29 | 47797 |
| 30 | 47947 |
| 31 | 47977 |
| 32 | 49477 |
| 33 | 49499 |
| 34 | 49747 |
| 35 | 49999 |
| 36 | 74449 |
| 37 | 74747 |
| 38 | 74779 |
| 39 | 74797 |
| 40 | 77447 |
| 41 | 77477 |
| 42 | 77479 |