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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 7 |
| 3 | 70 |
| 4 | 97 |
| 5 | 700 |
| 6 | 970 |
| 7 | 997 |
| 8 | 7000 |
| 9 | 9700 |
| 10 | 9747 |
| 11 | 9970 |
| 12 | 9997 |
| 13 | 70000 |
| 14 | 70997 |
| 15 | 75997 |
| 16 | 97000 |
| 17 | 97470 |
| 18 | 99700 |
| 19 | 99970 |
| 20 | 99997 |
| 21 | 700000 |
| 22 | 709970 |
| 23 | 709997 |
| 24 | 759970 |
| 25 | 759997 |
| 26 | 970000 |
| 27 | 974700 |
| 28 | 997000 |
| 29 | 999700 |
| 30 | 999970 |
| 31 | 999997 |
| 32 | 7000000 |
| 33 | 7050497 |
| 34 | 7099700 |
| 35 | 7099970 |
| 36 | 7099997 |
| 37 | 7450497 |
| 38 | 7599700 |
| 39 | 7599970 |
| 40 | 7599997 |
| 41 | 9700000 |
| 42 | 9747000 |
| 43 | 9970000 |
| 44 | 9979757 |
| 45 | 9997000 |
[0,7,70,97,700,970,997,7000,9700,9747,9970,9997, 70000,70997,75997,97000,97470,99700,99970,99997, 700000,709970,709997,759970,759997,970000,974700, 997000,999700,999970,999997,7000000,7050497, 7099700,7099970,7099997,7450497,7599700,7599970, 7599997,9700000,9747000,9970000,9979757,9997000] |