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| n | a(n) |
|---|---|
| 1 | 23 |
| 2 | 31 |
| 3 | 59 |
| 4 | 83 |
| 5 | 107 |
| 6 | 139 |
| 7 | 211 |
| 8 | 283 |
| 9 | 307 |
| 10 | 331 |
| 11 | 379 |
| 12 | 499 |
| 13 | 547 |
| 14 | 643 |
| 15 | 883 |
| 16 | 907 |
[23,31,59,83,107,139,211,283,307,331,379,499,547, 643,883,907] |