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| n | a(n) |
|---|---|
| 1 | 17 |
| 2 | 197 |
| 3 | 1997 |
| 4 | 19997 |
| 5 | 19999999999997 |
| 6 | 199999999999997 |
| 7 | 19999999999999999999999999999999999999999999999999999999999999999999999999997 |
[17,197,1997,19997,19999999999997,199999999999997, 19999999999999999999999999999999999999999999999999\ 999999999999999999999999997] |