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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 23 |
| 4 | 27 |
| 5 | 291 |
| 6 | 303 |
| 7 | 311 |
| 8 | 479 |
| 9 | 567 |
| 10 | 3087 |
| 11 | 18459 |
| 12 | 33575 |
| 13 | 43123 |
| 14 | 58291 |
| 15 | 155587 |
| 16 | 173007 |
| 17 | 414531 |
| 18 | 1220391 |
| 19 | 1337019 |
| 20 | 2081775 |
| 21 | 2401731 |
[3,7,23,27,291,303,311,479,567,3087,18459,33575, 43123,58291,155587,173007,414531,1220391,1337019, 2081775,2401731] |