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 | 1999 |
| 2 | 2999 |
| 3 | 4999 |
| 4 | 8999 |
| 5 | 13999 |
| 6 | 19991 |
| 7 | 19993 |
| 8 | 19997 |
| 9 | 25999 |
| 10 | 32999 |
| 11 | 35999 |
| 12 | 41999 |
| 13 | 49991 |
| 14 | 49993 |
| 15 | 49999 |
| 16 | 52999 |
| 17 | 56999 |
| 18 | 59999 |
| 19 | 69991 |
| 20 | 69997 |
| 21 | 70999 |
| 22 | 71999 |
| 23 | 73999 |
| 24 | 77999 |
| 25 | 79997 |
| 26 | 79999 |
| 27 | 85999 |
| 28 | 94999 |
| 29 | 98999 |
| 30 | 99901 |
| 31 | 99907 |
| 32 | 99923 |
| 33 | 99929 |
| 34 | 99961 |