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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 1117 |
| 6 | 1171 |
| 7 | 179991179 |
| 8 | 191797919 |
| 9 | 337353739 |
| 10 | 733353337 |
| 11 | 1193100992213191 |
| 12 | 1193120192093911 |
| 13 | 1193900112293191 |
| 14 | 1193902910213911 |
| 15 | 1733922710213719 |
| 16 | 1933913317893391 |
| 17 | 1933983337193191 |
| 18 | 3191100999231193 |
| 19 | 3191949710331913 |
| 20 | 3371722912019173 |
[2,3,5,7,1117,1171,179991179,191797919,337353739, 733353337,1193100992213191,1193120192093911, 1193900112293191,1193902910213911, 1733922710213719,1933913317893391, 1933983337193191,3191100999231193, 3191949710331913,3371722912019173] |