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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 11 |
| 3 | 13 |
| 4 | 43 |
| 5 | 241 |
| 6 | 683 |
| 7 | 2731 |
| 8 | 43691 |
| 9 | 61681 |
| 10 | 174763 |
| 11 | 2796203 |
| 12 | 15790321 |
| 13 | 715827883 |
| 14 | 4278255361 |
| 15 | 2932031007403 |
| 16 | 4363953127297 |
[3,11,13,43,241,683,2731,43691,61681,174763, 2796203,15790321,715827883,4278255361, 2932031007403,4363953127297] |