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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 97 |
| 3 | 997 |
| 4 | 9967 |
| 5 | 99643 |
| 6 | 998443 |
| 7 | 9986113 |
| 8 | 99979337 |
| 9 | 999962683 |
| 10 | 9987983617 |
| 11 | 99978397283 |
| 12 | 999631686353 |
| 13 | 9997564326947 |
| 14 | 99769267986197 |
| 15 | 999769267986197 |
| 16 | 9957969395462467 |
| 17 | 99957969395462467 |
| 18 | 992429121339693967 |
| 19 | 8963315421273233617 |
| 20 | 86312646216567629137 |
[7,97,997,9967,99643,998443,9986113,99979337, 999962683,9987983617,99978397283,999631686353, 9997564326947,99769267986197,999769267986197, 9957969395462467,99957969395462467, 992429121339693967,8963315421273233617, 86312646216567629137] |