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| n | a(n) |
|---|---|
| 0 | 10 |
| 1 | 19 |
| 2 | 109 |
| 3 | 1009 |
| 4 | 10009 |
| 5 | 100009 |
| 6 | 1000009 |
| 7 | 10000009 |
| 8 | 100000009 |
| 9 | 1000000009 |
| 10 | 10000000009 |
| 11 | 100000000009 |
| 12 | 1000000000009 |
| 13 | 10000000000009 |
| 14 | 100000000000009 |
| 15 | 1000000000000009 |
| 16 | 10000000000000009 |
| 17 | 100000000000000009 |
| 18 | 1000000000000000009 |
| 19 | 10000000000000000009 |
| 20 | 100000000000000000009 |
[10,19,109,1009,10009,100009,1000009,10000009, 100000009,1000000009,10000000009,100000000009, 1000000000009,10000000000009,100000000000009, 1000000000000009,10000000000000009, 100000000000000009,1000000000000000009, 10000000000000000009,100000000000000000009] |