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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 17 |
| 3 | 1117 |
| 4 | 11117 |
| 5 | 11111117 |
| 6 | 11111111111111111111117 |
| 7 | 11111111111111111111111111117 |
| 8 | 1111111111111111111111111111111111111117 |
[7,17,1117,11117,11111117,11111111111111111111117, 11111111111111111111111111117, 1111111111111111111111111111111111111117] |