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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 19 |
| 6 | 29 |
| 7 | 31 |
| 8 | 71 |
| 9 | 139 |
| 10 | 251 |
| 11 | 631 |
| 12 | 3433 |
| 13 | 12011 |
| 14 | 48619 |
| 15 | 51479 |
| 16 | 51481 |
| 17 | 2704157 |
| 18 | 155117519 |
| 19 | 280816201 |
| 20 | 4808643121 |
| 21 | 35345263801 |
| 22 | 81676217699 |
| 23 | 1378465288199 |
| 24 | 2104098963721 |
| 25 | 5651707681619 |
| 26 | 94684453367401 |
| 27 | 386971244197199 |
| 28 | 1580132580471899 |
| 29 | 1580132580471901 |
[2,3,5,7,19,29,31,71,139,251,631,3433,12011,48619, 51479,51481,2704157,155117519,280816201, 4808643121,35345263801,81676217699,1378465288199, 2104098963721,5651707681619,94684453367401, 386971244197199,1580132580471899,1580132580471901] |