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 | 11 |
| 2 | 31 |
| 3 | 41 |
| 4 | 61 |
| 5 | 71 |
| 6 | 137 |
| 7 | 193 |
| 8 | 257 |
| 9 | 467 |
| 10 | 1399 |
| 11 | 2887 |
| 12 | 35999 |
| 13 | 599699 |
| 14 | 4987999 |
| 15 | 589998989 |
| 16 | 2899889999 |
| 17 | 58989999989 |
| 18 | 58799999999999 |
| 19 | 579999998999999 |
| 20 | 19999999999997999 |
| 21 | 199999999999898999 |
| 22 | 499999999999899989 |
| 23 | 699999999999979999 |
| 24 | 799999999999988999 |
| 25 | 4999999999998899999 |
| 26 | 7999999999998999899 |
| 27 | 79999999999988999999 |