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 | 41 |
| 2 | 43 |
| 3 | 47 |
| 4 | 433 |
| 5 | 499 |
| 6 | 4111 |
| 7 | 4999 |
| 8 | 47777 |
| 9 | 49999 |
| 10 | 4999999 |
| 11 | 41111111111111 |
| 12 | 47777777777777 |
| 13 | 499999999999999 |
| 14 | 43333333333333333 |
| 15 | 41111111111111111111111111 |
| 16 | 47777777777777777777777777 |