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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 23 |
| 3 | 163 |
| 4 | 557 |
| 5 | 32843 |
| 6 | 2097257 |
| 7 | 8589934757 |
| 8 | 137438953657 |
| 9 | 2305843009213694257 |
| 10 | 2787593149816327892691964784081045188248257 |
| 11 | 730750818665451459101842416358141509827966272283 |
| 12 | 862718293348820473429344482784628181556388621521298319395315527976057 |
[7,23,163,557,32843,2097257,8589934757, 137438953657,2305843009213694257, 2787593149816327892691964784081045188248257, 730750818665451459101842416358141509827966272283, 86271829334882047342934448278462818155638862152129\ 8319395315527976057] |