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 | 5 |
| 3 | 7 |
| 4 | 17 |
| 5 | 31 |
| 6 | 13 |
| 7 | 127 |
| 8 | 257 |
| 9 | 73 |
| 10 | 41 |
| 11 | 683 |
| 12 | 241 |
| 13 | 8191 |
| 14 | 127 |
| 15 | 331 |
| 16 | 65537 |
| 17 | 131071 |
| 18 | 109 |
| 19 | 524287 |
| 20 | 61681 |
| 21 | 5419 |
| 22 | 2113 |
| 23 | 2796203 |
| 24 | 673 |
| 25 | 4051 |
| 26 | 8191 |
| 27 | 262657 |
| 28 | 15790321 |
| 29 | 3033169 |
| 30 | 1321 |
| 31 | 2147483647 |
| 32 | 6700417 |
| 33 | 599479 |
| 34 | 131071 |
| 35 | 122921 |
| 36 | 38737 |
| 37 | 616318177 |
| 38 | 525313 |
| 39 | 22366891 |