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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 97 |
| 3 | 998 |
| 4 | 9998 |
| 5 | 99998 |
| 6 | 999997 |
| 7 | 9999998 |
| 8 | 99999998 |
| 9 | 999999998 |
| 10 | 9999999998 |
| 11 | 99999999998 |
| 12 | 999999999998 |
| 13 | 9999999999998 |
| 14 | 99999999999998 |
| 15 | 999999999999998 |
| 16 | 9999999999999998 |
| 17 | 99999999999999998 |
| 18 | 999999999999999998 |
[7,97,998,9998,99998,999997,9999998,99999998, 999999998,9999999998,99999999998,999999999998, 9999999999998,99999999999998,999999999999998, 9999999999999998,99999999999999998, 999999999999999998] |