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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 7 |
| 3 | 13 |
| 4 | 19 |
| 5 | 31 |
| 6 | 61 |
| 7 | 1279 |
| 8 | 4423 |
| 9 | 110503 |
| 10 | 132049 |
| 11 | 20996011 |
| 12 | 24036583 |
[5,7,13,19,31,61,1279,4423,110503,132049,20996011, 24036583] |