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 | 3 |
| 2 | 13 |
| 3 | 103 |
| 4 | 1013 |
| 5 | 10007 |
| 6 | 100003 |
| 7 | 1000003 |
| 8 | 10000019 |
| 9 | 100000007 |
| 10 | 1000000007 |
| 11 | 10000000019 |
| 12 | 100000000003 |
| 13 | 1000000000061 |
| 14 | 10000000000037 |
| 15 | 100000000000031 |
| 16 | 1000000000000037 |
| 17 | 10000000000000061 |
| 18 | 100000000000000003 |
| 19 | 1000000000000000003 |
| 20 | 10000000000000000097 |