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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 797 |
| 3 | 797997 |
| 4 | 7979979973 |
| 5 | 797997997399991 |
| 6 | 797997997399991999983 |
| 7 | 7979979973999919999839999991 |
| 8 | 797997997399991999983999999199999989 |
| 9 | 797997997399991999983999999199999989999999937 |
| 10 | 7979979973999919999839999991999999899999999379999999967 |
[7,797,797997,7979979973,797997997399991, 797997997399991999983, 7979979973999919999839999991, 797997997399991999983999999199999989, 797997997399991999983999999199999989999999937, 79799799739999199998399999919999998999999993799999\ 99967] |