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 | 277 |
| 2 | 577 |
| 3 | 677 |
| 4 | 727 |
| 5 | 757 |
| 6 | 773 |
| 7 | 787 |
| 8 | 797 |
| 9 | 877 |
| 10 | 977 |
| 11 | 1777 |
| 12 | 2777 |
| 13 | 7177 |
| 14 | 7477 |
| 15 | 7577 |
| 16 | 7717 |
| 17 | 7727 |
| 18 | 7757 |
| 19 | 7877 |
| 20 | 47777 |
| 21 | 67777 |
| 22 | 71777 |
| 23 | 76777 |
| 24 | 77377 |
| 25 | 77477 |
| 26 | 77747 |
| 27 | 77773 |
| 28 | 77797 |
| 29 | 77977 |
| 30 | 79777 |
| 31 | 97777 |
| 32 | 727777 |
| 33 | 773777 |
| 34 | 775777 |
| 35 | 777277 |
| 36 | 777677 |
| 37 | 777737 |
| 38 | 777787 |