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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 13 |
| 6 | 23 |
| 7 | 31 |
| 8 | 113 |
| 9 | 1327 |
| 10 | 31397 |
| 11 | 370261 |
| 12 | 492113 |
| 13 | 2010733 |
| 14 | 20831323 |
| 15 | 25056082087 |
| 16 | 42652618343 |
| 17 | 2614941710599 |
| 18 | 19581334192423 |
[2,3,5,7,13,23,31,113,1327,31397,370261,492113, 2010733,20831323,25056082087,42652618343, 2614941710599,19581334192423] |