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 | 5 |
| 2 | 7 |
| 3 | 557 |
| 4 | 577 |
| 5 | 757 |
| 6 | 5077 |
| 7 | 5507 |
| 8 | 5557 |
| 9 | 7057 |
| 10 | 7507 |
| 11 | 7577 |
| 12 | 7757 |
| 13 | 50077 |
| 14 | 50707 |
| 15 | 50777 |
| 16 | 55057 |
| 17 | 57077 |
| 18 | 57557 |
| 19 | 70507 |
| 20 | 75557 |
| 21 | 75577 |
| 22 | 75707 |
| 23 | 77557 |
| 24 | 500057 |
| 25 | 500777 |
| 26 | 505777 |
| 27 | 507077 |
| 28 | 507557 |
| 29 | 507757 |
| 30 | 550007 |
| 31 | 550577 |
| 32 | 550757 |
| 33 | 555077 |
| 34 | 555557 |
| 35 | 555707 |
| 36 | 557057 |
| 37 | 570077 |
| 38 | 575077 |