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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 15 |
| 3 | 23 |
| 4 | 31 |
| 5 | 39 |
| 6 | 63 |
| 7 | 79 |
| 8 | 95 |
| 9 | 127 |
| 10 | 175 |
| 11 | 207 |
| 12 | 255 |
| 13 | 511 |
| 14 | 543 |
| 15 | 607 |
| 16 | 767 |
| 17 | 1023 |
| 18 | 1279 |
| 19 | 2047 |
| 20 | 4095 |
| 21 | 4423 |
| 22 | 5135 |
[7,15,23,31,39,63,79,95,127,175,207,255,511,543, 607,767,1023,1279,2047,4095,4423,5135] |