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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 23 |
| 6 | 27 |
| 7 | 35 |
| 8 | 37 |
| 9 | 53 |
| 10 | 57 |
| 11 | 73 |
| 12 | 75 |
| 13 | 213 |
| 14 | 235 |
| 15 | 357 |
| 16 | 373 |
| 17 | 513 |
| 18 | 535 |
| 19 | 573 |
| 20 | 737 |
| 21 | 753 |
| 22 | 3513 |
[2,3,5,7,23,27,35,37,53,57,73,75,213,235,357,373, 513,535,573,737,753,3513] |