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 | 607 |
| 6 | 647 |
| 7 | 677 |
| 8 | 4007 |
| 9 | 4447 |
| 10 | 6007 |
| 11 | 6047 |
| 12 | 6067 |
| 13 | 6607 |
| 14 | 7477 |
| 15 | 7607 |
| 16 | 44647 |
| 17 | 44777 |
| 18 | 46447 |
| 19 | 46477 |
| 20 | 46747 |
| 21 | 47407 |
| 22 | 47777 |
| 23 | 60077 |
| 24 | 60607 |
| 25 | 60647 |
| 26 | 64007 |
| 27 | 64067 |
| 28 | 64667 |
| 29 | 64747 |
| 30 | 66047 |
| 31 | 66067 |
| 32 | 66467 |
| 33 | 67447 |
| 34 | 67477 |
| 35 | 67607 |
| 36 | 67777 |
| 37 | 70067 |
| 38 | 70607 |
| 39 | 70667 |
| 40 | 74047 |
| 41 | 74077 |