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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 7 |
| 3 | 11 |
| 4 | 31 |
| 5 | 59 |
| 6 | 409 |
| 7 | 1733 |
| 8 | 229639 |
| 9 | 21827579 |
| 10 | 131527051677179 |
| 11 | 606997343490162629 |
| 12 | 12604484198222791879 |
| 13 | 32799650788086796039050629 |
| 14 | 1140711996797519078728387466879 |
| 15 | 7575339494576348459668940121110928768987796879 |
[5,7,11,31,59,409,1733,229639,21827579, 131527051677179,606997343490162629, 12604484198222791879,32799650788086796039050629, 1140711996797519078728387466879, 7575339494576348459668940121110928768987796879] |