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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 29 |
| 5 | 59 |
| 6 | 1889 |
| 7 | 3779 |
| 8 | 7559 |
| 9 | 4058207223809 |
| 10 | 32465657790473 |
| 11 | 4462046030502692971872257 |
| 12 | 9582170887127842377060195852353537 |
[2,3,7,29,59,1889,3779,7559,4058207223809, 32465657790473,4462046030502692971872257, 9582170887127842377060195852353537] |