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| n | a(n) |
|---|---|
| 1 | 6661 |
| 2 | 16661 |
| 3 | 66601 |
| 4 | 76667 |
| 5 | 700666007 |
| 6 | 6660000000001 |
| 7 | 666000000000001 |
| 8 | 700000666000007 |
| 9 | 70000006660000007 |
| 10 | 6660000000000000000000000007 |
| 11 | 66600000000000000000000000007 |
| 12 | 1000000000000066600000000000001 |
[6661,16661,66601,76667,700666007,6660000000001, 666000000000001,700000666000007,70000006660000007, 6660000000000000000000000007, 66600000000000000000000000007, 1000000000000066600000000000001] |