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 | 151 |
| 6 | 181 |
| 7 | 191 |
| 8 | 353 |
| 9 | 373 |
| 10 | 383 |
| 11 | 727 |
| 12 | 757 |
| 13 | 787 |
| 14 | 797 |
| 15 | 17971 |
| 16 | 19891 |
| 17 | 19991 |
| 18 | 38783 |
| 19 | 74747 |
| 20 | 75557 |
| 21 | 76367 |
| 22 | 76667 |
| 23 | 77477 |
| 24 | 77977 |
| 25 | 78787 |
| 26 | 78887 |
| 27 | 79697 |
| 28 | 79997 |
| 29 | 1879781 |
| 30 | 1895981 |
| 31 | 1969691 |
| 32 | 1987891 |
| 33 | 1988891 |
| 34 | 1998991 |
| 35 | 3799973 |
| 36 | 3899983 |
| 37 | 3997993 |
| 38 | 3998993 |
| 39 | 7696967 |