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 | 7 |
| 3 | 37 |
| 4 | 43 |
| 5 | 47 |
| 6 | 73 |
| 7 | 337 |
| 8 | 347 |
| 9 | 373 |
| 10 | 433 |
| 11 | 443 |
| 12 | 733 |
| 13 | 743 |
| 14 | 773 |
| 15 | 3343 |
| 16 | 3347 |
| 17 | 3373 |
| 18 | 3433 |
| 19 | 3733 |
| 20 | 4337 |
| 21 | 4373 |
| 22 | 4447 |
| 23 | 4733 |
| 24 | 7333 |
| 25 | 7433 |
| 26 | 7477 |
| 27 | 33343 |
| 28 | 33347 |
| 29 | 33377 |
| 30 | 33773 |
| 31 | 34337 |
| 32 | 34747 |
| 33 | 37337 |
| 34 | 37447 |
| 35 | 37747 |
| 36 | 43777 |
| 37 | 44773 |
| 38 | 44777 |
| 39 | 47737 |
| 40 | 47743 |
| 41 | 47777 |
| 42 | 73433 |
| 43 | 73477 |
| 44 | 74377 |
| 45 | 74747 |
| 46 | 77347 |
| 47 | 77377 |
| 48 | 77447 |
| 49 | 77477 |
| 50 | 77743 |