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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 31 |
| 4 | 73 |
| 5 | 85 |
| 6 | 127 |
| 7 | 2047 |
| 8 | 3133 |
| 9 | 4369 |
| 10 | 8191 |
| 11 | 11275 |
| 12 | 49981 |
| 13 | 60787 |
| 14 | 76627 |
| 15 | 121369 |
| 16 | 131071 |
| 17 | 140911 |
| 18 | 178481 |
| 19 | 262657 |
| 20 | 486737 |
| 21 | 524287 |
| 22 | 599479 |
| 23 | 1082401 |
[3,7,31,73,85,127,2047,3133,4369,8191,11275,49981, 60787,76627,121369,131071,140911,178481,262657, 486737,524287,599479,1082401] |