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 | 757 |
| 2 | 131113 |
| 3 | 171317 |
| 4 | 231923 |
| 5 | 312931 |
| 6 | 474347 |
| 7 | 978997 |
| 8 | 10197101 |
| 9 | 107103107 |
| 10 | 127113127 |
| 11 | 139137139 |
| 12 | 151149151 |
| 13 | 167163167 |
| 14 | 367359367 |
| 15 | 421419421 |
| 16 | 433431433 |
| 17 | 461457461 |
| 18 | 617613617 |
| 19 | 643641643 |
| 20 | 701691701 |
| 21 | 863859863 |
| 22 | 911907911 |
| 23 | 991983991 |
| 24 | 102110191021 |
| 25 | 103110211031 |
| 26 | 103310311033 |
| 27 | 104910391049 |