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| 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 |
[7,77,177,277,377,477,577,677,707,717,727,737,747, 757,767,770,771,772,773,774,775,776,777,778,779, 787,797,877,977,1777,2777,3777,4777,5777,6777, 7077,7177,7277,7377,7477,7577,7677,7707,7717,7727, 7737,7747,7757,7767,7770,7771,7772,7773,7774,7775, 7776,7777,7778] |