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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 31 |
| 4 | 4808643121 |
| 5 | 483701705079089804581 |
| 6 | 3283733939424401442167506310317720418331001 |
[3,7,31,4808643121,483701705079089804581, 3283733939424401442167506310317720418331001] |