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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 97 |
| 3 | 983 |
| 4 | 9941 |
| 5 | 99839 |
| 6 | 999983 |
| 7 | 9998239 |
| 8 | 99999989 |
| 9 | 999950881 |
| 10 | 9999999929 |
| 11 | 99999999833 |
| 12 | 999999999989 |
| 13 | 9999999999863 |
| 14 | 99999999999971 |
| 15 | 999999961946087 |
| 16 | 9999999999999917 |
| 17 | 99999999989350667 |
| 18 | 999999999999999989 |
[7,97,983,9941,99839,999983,9998239,99999989, 999950881,9999999929,99999999833,999999999989, 9999999999863,99999999999971,999999961946087, 9999999999999917,99999999989350667, 999999999999999989] |