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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 13 |
| 4 | 13 |
| 5 | 31 |
| 6 | 31 |
| 7 | 71 |
| 8 | 73 |
| 9 | 73 |
| 10 | 71 |
| 11 | 199 |
| 12 | 157 |
| 13 | 157 |
| 14 | 211 |
| 15 | 211 |
| 16 | 337 |
| 17 | 199 |
| 18 | 419 |
[2,5,13,13,31,31,71,73,73,71,199,157,157,211,211, 337,199,419] |