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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 37 |
| 3 | 3731 |
| 4 | 3731127 |
| 5 | 37311278191 |
| 6 | 37311278191131071 |
| 7 | 37311278191131071524287 |
| 8 | 373112781911310715242872147483647 |
| 9 | 3731127819113107152428721474836472305843009213693951 |
[3,37,3731,3731127,37311278191,37311278191131071, 37311278191131071524287, 373112781911310715242872147483647, 37311278191131071524287214748364723058430092136939\ 51] |