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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 23 |
| 5 | 25 |
| 6 | 32 |
| 7 | 43 |
| 8 | 52 |
| 9 | 65 |
| 10 | 443 |
| 11 | 452 |
| 12 | 623 |
| 13 | 625 |
| 14 | 632 |
| 15 | 652 |
| 16 | 2452 |
| 17 | 2623 |
| 18 | 6625 |
| 19 | 6652 |
| 20 | 42623 |
| 21 | 642623 |
| 22 | 6642623 |
[2,3,5,23,25,32,43,52,65,443,452,623,625,632,652, 2452,2623,6625,6652,42623,642623,6642623] |