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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 31 |
| 5 | 127 |
| 6 | 8191 |
| 7 | 131071 |
| 8 | 524287 |
| 9 | 2147483647 |
| 10 | 2305843009213693951 |
| 11 | 618970019642690137449562111 |
| 12 | 162259276829213363391578010288127 |
| 13 | 170141183460469231731687303715884105727 |
[2,3,7,31,127,8191,131071,524287,2147483647, 2305843009213693951,618970019642690137449562111, 162259276829213363391578010288127, 170141183460469231731687303715884105727] |