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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 7 |
| 3 | 64 |
| 4 | 70 |
| 5 | 97 |
| 6 | 640 |
| 7 | 700 |
| 8 | 970 |
| 9 | 997 |
| 10 | 6400 |
| 11 | 6907 |
| 12 | 7000 |
| 13 | 7064 |
| 14 | 9700 |
| 15 | 9970 |
| 16 | 9997 |
| 17 | 64000 |
| 18 | 69070 |
| 19 | 70000 |
| 20 | 70640 |
| 21 | 77974 |
| 22 | 97000 |
| 23 | 99700 |
| 24 | 99747 |
| 25 | 99970 |
| 26 | 99997 |
| 27 | 640000 |
| 28 | 666907 |
| 29 | 667907 |
| 30 | 690700 |
| 31 | 700000 |
| 32 | 700497 |
| 33 | 706400 |
| 34 | 774647 |
| 35 | 777676 |
| 36 | 779740 |
| 37 | 970000 |
| 38 | 997000 |
| 39 | 997470 |
| 40 | 999700 |
| 41 | 999747 |
| 42 | 999970 |
| 43 | 999997 |
| 44 | 6400000 |
| 45 | 6400774 |
| 46 | 6669070 |
| 47 | 6679070 |
| 48 | 6907000 |
| 49 | 7000000 |
[0,7,64,70,97,640,700,970,997,6400,6907,7000,7064, 9700,9970,9997,64000,69070,70000,70640,77974, 97000,99700,99747,99970,99997,640000,666907, 667907,690700,700000,700497,706400,774647,777676, 779740,970000,997000,997470,999700,999747,999970, 999997,6400000,6400774,6669070,6679070,6907000, 7000000] |