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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 97 |
| 3 | 997 |
| 4 | 9973 |
| 5 | 99991 |
| 6 | 999979 |
| 7 | 9999991 |
| 8 | 99999971 |
| 9 | 999999937 |
| 10 | 9999999557 |
| 11 | 99999999977 |
| 12 | 999999999959 |
| 13 | 9999999999971 |
| 14 | 99999999999973 |
| 15 | 999999999999577 |
| 16 | 9999999999999937 |
| 17 | 99999999999999997 |
| 18 | 999999999999999737 |
[7,97,997,9973,99991,999979,9999991,99999971, 999999937,9999999557,99999999977,999999999959, 9999999999971,99999999999973,999999999999577, 9999999999999937,99999999999999997, 999999999999999737] |