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| n | a(n) |
|---|---|
| 1 | 7777 |
| 2 | 17777 |
| 3 | 27777 |
| 4 | 37777 |
| 5 | 47777 |
| 6 | 57777 |
| 7 | 67777 |
| 8 | 70777 |
| 9 | 71777 |
| 10 | 72777 |
| 11 | 73777 |
| 12 | 74777 |
| 13 | 75777 |
| 14 | 76777 |
| 15 | 77077 |
| 16 | 77177 |
| 17 | 77277 |
| 18 | 77377 |
| 19 | 77477 |
| 20 | 77577 |
| 21 | 77677 |
| 22 | 77707 |
| 23 | 77717 |
| 24 | 77727 |
| 25 | 77737 |
| 26 | 77747 |
| 27 | 77757 |
| 28 | 77767 |
| 29 | 77770 |
| 30 | 77771 |
| 31 | 77772 |
[7777,17777,27777,37777,47777,57777,67777,70777, 71777,72777,73777,74777,75777,76777,77077,77177, 77277,77377,77477,77577,77677,77707,77717,77727, 77737,77747,77757,77767,77770,77771,77772] |