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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 13 |
| 6 | 17 |
| 7 | 31 |
| 8 | 37 |
| 9 | 71 |
| 10 | 73 |
| 11 | 79 |
| 12 | 97 |
| 13 | 113 |
| 14 | 131 |
| 15 | 199 |
| 16 | 311 |
| 17 | 337 |
| 18 | 373 |
| 19 | 733 |
| 20 | 919 |
| 21 | 991 |
[2,3,5,7,13,17,31,37,71,73,79,97,113,131,199,311, 337,373,733,919,991] |