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| n | a(n) |
|---|---|
| 0 | 21 |
| 1 | 23 |
| 2 | 25 |
| 3 | 27 |
| 4 | 29 |
| 5 | 31 |
| 6 | 34 |
| 7 | 37 |
| 8 | 43 |
| 9 | 51 |
| 10 | 111 |
| 11 | 133 |
| 12 | 1011 |
| 13 | 11111 |
| 14 | 1111111111111111111111111111111 |
[21,23,25,27,29,31,34,37,43,51,111,133,1011,11111, 1111111111111111111111111111111] |