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 | 35 |
| 2 | 57 |
| 3 | 1113 |
| 4 | 1719 |
| 5 | 2931 |
| 6 | 4143 |
| 7 | 5961 |
| 8 | 7173 |
| 9 | 101103 |
| 10 | 107109 |
| 11 | 137139 |
| 12 | 149151 |
| 13 | 179181 |
| 14 | 191193 |
| 15 | 197199 |
| 16 | 227229 |
| 17 | 239241 |
| 18 | 269271 |
| 19 | 281283 |
| 20 | 311313 |
| 21 | 347349 |
| 22 | 419421 |
| 23 | 431433 |
| 24 | 461463 |
| 25 | 521523 |
| 26 | 569571 |
| 27 | 599601 |
| 28 | 617619 |
| 29 | 641643 |
| 30 | 659661 |