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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 3 |
| 3 | 9 |
| 4 | 3 |
| 5 | 33 |
| 6 | 31 |
| 7 | 129 |
| 8 | 31 |
| 9 | 513 |
| 10 | 511 |
| 11 | 2049 |
| 12 | 1023 |
| 13 | 8193 |
| 14 | 8191 |
| 15 | 32769 |
| 16 | 4095 |
| 17 | 131073 |
| 18 | 131071 |
| 19 | 524289 |
| 20 | 262143 |
| 21 | 2097153 |
| 22 | 2097151 |
| 23 | 8388609 |
| 24 | 2097151 |
[3,3,9,3,33,31,129,31,513,511,2049,1023,8193,8191, 32769,4095,131073,131071,524289,262143,2097153, 2097151,8388609,2097151] |