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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 2047 |
| 3 | 402653183 |
| 4 | 1180591620717411303423 |
| 5 | 233840261972944466912589573234605283144949206876159 |
[7,2047,402653183,1180591620717411303423, 23384026197294446691258957323460528314494920687615\ 9] |