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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 17 |
| 3 | 37 |
| 4 | 41 |
| 5 | 137 |
| 6 | 257 |
| 7 | 2147483777 |
| 8 | 162259895799233006081715459850241 |
[13,17,37,41,137,257,2147483777, 162259895799233006081715459850241] |