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| n | a(n) |
|---|---|
| 1 | 53 |
| 2 | 127 |
| 3 | 431 |
| 4 | 1999 |
| 5 | 8191 |
| 6 | 18521 |
| 7 | 27647 |
| 8 | 31249 |
| 9 | 59581 |
| 10 | 78607 |
| 11 | 159013 |
| 12 | 194671 |
| 13 | 314927 |
| 14 | 332749 |
| 15 | 390223 |
| 16 | 453961 |
| 17 | 524287 |
| 18 | 657017 |
| 19 | 1062881 |
| 20 | 1457999 |
| 21 | 1507141 |
| 22 | 1608713 |
| 23 | 1940597 |
| 24 | 2519423 |
| 25 | 3455999 |
| 26 | 4000751 |
| 27 | 4393999 |
| 28 | 5371237 |
| 29 | 5606441 |
[53,127,431,1999,8191,18521,27647,31249,59581, 78607,159013,194671,314927,332749,390223,453961, 524287,657017,1062881,1457999,1507141,1608713, 1940597,2519423,3455999,4000751,4393999,5371237, 5606441] |