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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 59 |
| 3 | 531 |
| 4 | 5099 |
| 5 | 50316 |
| 6 | 500999 |
| 7 | 5003162 |
| 8 | 50009999 |
| 9 | 500031622 |
| 10 | 5000099999 |
| 11 | 50000316227 |
| 12 | 500000999999 |
| 13 | 5000003162277 |
| 14 | 50000009999999 |
| 15 | 500000031622776 |
| 16 | 5000000099999999 |
| 17 | 50000000316227766 |
| 18 | 500000000999999999 |
| 19 | 5000000003162277660 |
| 20 | 50000000009999999999 |
[7,59,531,5099,50316,500999,5003162,50009999, 500031622,5000099999,50000316227,500000999999, 5000003162277,50000009999999,500000031622776, 5000000099999999,50000000316227766, 500000000999999999,5000000003162277660, 50000000009999999999] |