The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 9 |
| 5 | 17 |
| 6 | 51 |
| 7 | 127 |
| 8 | 129 |
| 9 | 257 |
| 10 | 771 |
| 11 | 1799 |
| 12 | 2313 |
| 13 | 4369 |
| 14 | 13107 |
| 15 | 32767 |
| 16 | 32769 |
| 17 | 65537 |
| 18 | 196611 |
| 19 | 458759 |
| 20 | 589833 |
| 21 | 1114129 |
| 22 | 3342387 |
| 23 | 8323199 |
| 24 | 8454273 |
| 25 | 16843009 |
| 26 | 50529027 |
| 27 | 117901063 |
| 28 | 151587081 |
| 29 | 286331153 |
| 30 | 858993459 |
| 31 | 2147483647 |
| 32 | 2147483649 |
| 33 | 4294967297 |
| 34 | 12884901891 |
[1,3,7,9,17,51,127,129,257,771,1799,2313,4369, 13107,32767,32769,65537,196611,458759,589833, 1114129,3342387,8323199,8454273,16843009,50529027, 117901063,151587081,286331153,858993459, 2147483647,2147483649,4294967297,12884901891] |