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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 97 |
| 3 | 997 |
| 4 | 9949 |
| 5 | 99991 |
| 6 | 999979 |
| 7 | 9999991 |
| 8 | 99999989 |
| 9 | 999999929 |
| 10 | 9999999929 |
| 11 | 99999999599 |
| 12 | 999999999989 |
| 13 | 9999999999799 |
| 14 | 99999999999959 |
| 15 | 999999999999989 |
| 16 | 9999999999999199 |
| 17 | 99999999999999997 |
| 18 | 999999999999999989 |
| 19 | 9999999999999999919 |
| 20 | 99999999999999999989 |
| 21 | 999999999999999999899 |
| 22 | 9999999999999999999929 |
[7,97,997,9949,99991,999979,9999991,99999989, 999999929,9999999929,99999999599,999999999989, 9999999999799,99999999999959,999999999999989, 9999999999999199,99999999999999997, 999999999999999989,9999999999999999919, 99999999999999999989,999999999999999999899, 9999999999999999999929] |