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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 5 |
| 3 | 37 |
| 4 | 41 |
| 5 | 43 |
| 6 | 59 |
| 7 | 71 |
| 8 | 113 |
| 9 | 181 |
| 10 | 293 |
| 11 | 383 |
| 12 | 421 |
| 13 | 1109 |
| 14 | 1187 |
| 15 | 1997 |
| 16 | 3109 |
| 17 | 4889 |
| 18 | 5581 |
| 19 | 67961 |
| 20 | 74843 |
[3,5,37,41,43,59,71,113,181,293,383,421,1109,1187, 1997,3109,4889,5581,67961,74843] |