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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 13 |
| 5 | 23 |
| 6 | 37 |
| 7 | 59 |
| 8 | 73 |
| 9 | 101 |
| 10 | 131 |
| 11 | 163 |
| 12 | 199 |
| 13 | 241 |
| 14 | 293 |
| 15 | 349 |
| 16 | 401 |
| 17 | 457 |
| 18 | 523 |
| 19 | 599 |
| 20 | 661 |
| 21 | 757 |
| 22 | 713 |
| 23 | 851 |
| 24 | 1049 |
| 25 | 1153 |
| 26 | 1277 |
| 27 | 1381 |
[1,3,7,13,23,37,59,73,101,131,163,199,241,293,349, 401,457,523,599,661,757,713,851,1049,1153,1277, 1381] |