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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 5 |
| 4 | 6 |
| 5 | 11 |
| 6 | 13 |
| 7 | 17 |
| 8 | 23 |
| 9 | 31 |
| 10 | 37 |
| 11 | 47 |
| 12 | 53 |
| 13 | 67 |
| 14 | 79 |
| 15 | 103 |
| 16 | 107 |
| 17 | 139 |
| 18 | 149 |
| 19 | 223 |
| 20 | 269 |
| 21 | 283 |
| 22 | 317 |
| 23 | 557 |
| 24 | 619 |
| 25 | 643 |
| 26 | 1699 |
| 27 | 2477 |
| 28 | 3343 |
[2,4,5,6,11,13,17,23,31,37,47,53,67,79,103,107, 139,149,223,269,283,317,557,619,643,1699,2477, 3343] |