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 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 181 |
| 6 | 191 |
| 7 | 313 |
| 8 | 353 |
| 9 | 373 |
| 10 | 383 |
| 11 | 727 |
| 12 | 757 |
| 13 | 787 |
| 14 | 797 |
| 15 | 17971 |
| 16 | 19891 |
| 17 | 19991 |
| 18 | 34843 |
| 19 | 35753 |
| 20 | 36563 |
| 21 | 37573 |
| 22 | 38783 |
| 23 | 74747 |
| 24 | 75557 |
| 25 | 76667 |
| 26 | 77977 |
| 27 | 78787 |
| 28 | 78887 |
| 29 | 79997 |
| 30 | 1987891 |
| 31 | 1988891 |
| 32 | 1998991 |
| 33 | 3479743 |
| 34 | 3487843 |
| 35 | 3569653 |
| 36 | 3586853 |
| 37 | 3589853 |
| 38 | 3689863 |
| 39 | 3698963 |