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 | 7 |
| 2 | 77 |
| 3 | 177 |
| 4 | 277 |
| 5 | 377 |
| 6 | 477 |
| 7 | 577 |
| 8 | 677 |
| 9 | 707 |
| 10 | 717 |
| 11 | 727 |
| 12 | 737 |
| 13 | 747 |
| 14 | 757 |
| 15 | 767 |
| 16 | 770 |
| 17 | 771 |
| 18 | 772 |
| 19 | 773 |
| 20 | 774 |
| 21 | 775 |
| 22 | 776 |
| 23 | 777 |
| 24 | 778 |
| 25 | 779 |
| 26 | 787 |
| 27 | 797 |
| 28 | 877 |
| 29 | 977 |
| 30 | 1777 |
| 31 | 2777 |
| 32 | 3777 |
| 33 | 4777 |
| 34 | 5777 |
| 35 | 6777 |
| 36 | 7077 |
| 37 | 7177 |
| 38 | 7277 |
| 39 | 7377 |
| 40 | 7477 |
| 41 | 7577 |
| 42 | 7677 |
| 43 | 7707 |
| 44 | 7717 |
| 45 | 7727 |
| 46 | 7737 |
| 47 | 7747 |
| 48 | 7757 |
| 49 | 7767 |
| 50 | 7770 |
| 51 | 7771 |
| 52 | 7772 |
| 53 | 7773 |
| 54 | 7774 |
| 55 | 7775 |
| 56 | 7776 |
| 57 | 7777 |
| 58 | 7778 |