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 | 17 |
| 3 | 31 |
| 4 | 59 |
| 5 | 997 |
| 6 | 2837 |
| 7 | 57349 |
| 8 | 83773 |
| 9 | 224813 |
| 10 | 861743 |
| 11 | 9999991 |
| 12 | 61879669 |
| 13 | 95895673 |
| 14 | 763137931 |
| 15 | 1463016067 |
| 16 | 1608398527 |
| 17 | 6909512173 |
| 18 | 38095693807 |
| 19 | 94041857089 |
| 20 | 4913845865567 |