The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 5 |
| 3 | 17 |
| 4 | 257 |
| 5 | 65537 |
| 6 | 4294967311 |
| 7 | 1229782942255939601 |
| 8 | 88962710886098567818446141338419231 |
| 9 | 255302062200114858892457591448999891874349780170241684791167583265041 |
[3,5,17,257,65537,4294967311,1229782942255939601, 88962710886098567818446141338419231, 25530206220011485889245759144899989187434978017024\ 1684791167583265041] |