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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 7 |
| 3 | 17 |
| 4 | 23 |
| 5 | 47 |
| 6 | 137 |
| 7 | 359 |
| 8 | 431 |
| 9 | 433 |
| 10 | 449 |
| 11 | 569 |
| 12 | 9311 |
| 13 | 14431 |
| 14 | 25561 |
| 15 | 35999 |
| 16 | 37511 |
| 17 | 50833 |
| 18 | 81839 |
| 19 | 104911 |
| 20 | 590041 |
| 21 | 593689 |
| 22 | 604711 |
| 23 | 1049897 |
| 24 | 1285607 |
| 25 | 1636007 |
| 26 | 1968721 |
[4,7,17,23,47,137,359,431,433,449,569,9311,14431, 25561,35999,37511,50833,81839,104911,590041, 593689,604711,1049897,1285607,1636007,1968721] |