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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 6 |
| 3 | 17 |
| 4 | 31 |
| 5 | 33 |
| 6 | 63 |
| 7 | 127 |
| 8 | 129 |
| 9 | 171 |
| 10 | 257 |
| 11 | 511 |
| 12 | 683 |
| 13 | 2047 |
| 14 | 2731 |
| 15 | 2979 |
| 16 | 3277 |
| 17 | 3641 |
| 18 | 8191 |
| 19 | 28197 |
| 20 | 43691 |
| 21 | 48771 |
| 22 | 52429 |
| 23 | 61681 |
| 24 | 65537 |
| 25 | 85489 |
| 26 | 131071 |
[5,6,17,31,33,63,127,129,171,257,511,683,2047, 2731,2979,3277,3641,8191,28197,43691,48771,52429, 61681,65537,85489,131071] |