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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 7 |
| 3 | 70 |
| 4 | 88 |
| 5 | 97 |
| 6 | 700 |
| 7 | 707 |
| 8 | 878 |
| 9 | 880 |
| 10 | 948 |
| 11 | 970 |
| 12 | 997 |
| 13 | 7000 |
| 14 | 7007 |
| 15 | 7070 |
| 16 | 8780 |
| 17 | 8798 |
| 18 | 8800 |
| 19 | 8947 |
| 20 | 9480 |
| 21 | 9700 |
| 22 | 9898 |
| 23 | 9970 |
| 24 | 9997 |
| 25 | 70000 |
| 26 | 70007 |
| 27 | 70070 |
| 28 | 70700 |
| 29 | 70707 |
| 30 | 87798 |
| 31 | 87800 |
| 32 | 87980 |
| 33 | 88000 |
| 34 | 89448 |
| 35 | 89470 |
| 36 | 94800 |
| 37 | 97000 |
| 38 | 98980 |
| 39 | 99448 |
| 40 | 99700 |
| 41 | 99970 |
| 42 | 99997 |
| 43 | 700000 |
| 44 | 700007 |
| 45 | 700070 |
| 46 | 700700 |
| 47 | 707000 |
| 48 | 707070 |
| 49 | 877898 |
| 50 | 877980 |
| 51 | 877998 |
| 52 | 878000 |
| 53 | 879800 |
[0,7,70,88,97,700,707,878,880,948,970,997,7000, 7007,7070,8780,8798,8800,8947,9480,9700,9898,9970, 9997,70000,70007,70070,70700,70707,87798,87800, 87980,88000,89448,89470,94800,97000,98980,99448, 99700,99970,99997,700000,700007,700070,700700, 707000,707070,877898,877980,877998,878000,879800] |