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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 3 |
| 2 | 5 |
| 3 | 7 |
| 4 | 17 |
| 5 | 59 |
| 6 | 167 |
| 7 | 821 |
| 8 | 2539 |
| 9 | 1042259 |
| 10 | 508903 |
| 11 | 5765312303 |
| 12 | 1461701 |
| 13 | 1404527126434567 |
| 14 | 2034580216153 |
| 15 | 97552206663238517 |
| 16 | 3105563257 |
| 17 | 46137561830961960349 |
| 18 | 9777395920402541 |
| 19 | 6719860896292085951563127 |
| 20 | 5367788603966004659 |
| 21 | 33011914147 |
[2,3,5,7,17,59,167,821,2539,1042259,508903, 5765312303,1461701,1404527126434567,2034580216153, 97552206663238517,3105563257,46137561830961960349, 9777395920402541,6719860896292085951563127, 5367788603966004659,33011914147] |