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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 5 |
| 3 | 73 |
| 4 | 17 |
| 5 | 1153 |
| 6 | 257 |
| 7 | 1153 |
| 8 | 257 |
| 9 | 18433 |
| 10 | 25601 |
| 11 | 18433 |
| 12 | 65537 |
| 13 | 1179649 |
| 14 | 65537 |
| 15 | 1179649 |
| 16 | 65537 |
| 17 | 1179649 |
| 18 | 26214401 |
| 19 | 117964801 |
| 20 | 26214401 |
| 21 | 169869313 |
| 22 | 104857601 |
| 23 | 2717908993 |
| 24 | 10485760001 |
| 25 | 2717908993 |
| 26 | 11341398017 |
| 27 | 10871635969 |
| 28 | 52613349377 |
[3,5,73,17,1153,257,1153,257,18433,25601,18433, 65537,1179649,65537,1179649,65537,1179649, 26214401,117964801,26214401,169869313,104857601, 2717908993,10485760001,2717908993,11341398017, 10871635969,52613349377] |