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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 67 |
| 5 | 153979499670311863 |
| 6 | 96139392052480758114443739387402080695373863 |
[2,3,7,67,153979499670311863, 96139392052480758114443739387402080695373863] |