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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 17 |
| 3 | 31 |
| 4 | 59 |
| 5 | 997 |
| 6 | 2837 |
| 7 | 57349 |
| 8 | 83773 |
| 9 | 224813 |
| 10 | 861743 |
| 11 | 9999991 |
| 12 | 61879669 |
| 13 | 95895673 |
| 14 | 763137931 |
| 15 | 1463016067 |
| 16 | 1608398527 |
| 17 | 6909512173 |
| 18 | 38095693807 |
| 19 | 94041857089 |
| 20 | 4913845865567 |
[3,17,31,59,997,2837,57349,83773,224813,861743, 9999991,61879669,95895673,763137931,1463016067, 1608398527,6909512173,38095693807,94041857089, 4913845865567] |