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 | 79 |
| 3 | 97 |
| 4 | 709 |
| 5 | 797 |
| 6 | 907 |
| 7 | 977 |
| 8 | 997 |
| 9 | 7079 |
| 10 | 7907 |
| 11 | 9007 |
| 12 | 9907 |
| 13 | 70009 |
| 14 | 70079 |
| 15 | 70099 |
| 16 | 70709 |
| 17 | 70979 |
| 18 | 70997 |
| 19 | 70999 |
| 20 | 77797 |
| 21 | 77977 |
| 22 | 77999 |
| 23 | 79777 |
| 24 | 79907 |
| 25 | 79979 |
| 26 | 79997 |
| 27 | 79999 |
| 28 | 90007 |
| 29 | 90709 |
| 30 | 90907 |
| 31 | 90977 |
| 32 | 90997 |
| 33 | 97007 |
| 34 | 97777 |
| 35 | 99079 |
| 36 | 99707 |
| 37 | 99709 |
| 38 | 99907 |
| 39 | 700079 |