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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 13 |
| 3 | 23 |
| 4 | 113 |
| 5 | 137 |
| 6 | 373 |
| 7 | 1973 |
| 8 | 1733 |
| 9 | 1373 |
| 10 | 11317 |
| 11 | 17333 |
| 12 | 31379 |
| 13 | 37337 |
| 14 | 113173 |
| 15 | 211373 |
| 16 | 313739 |
| 17 | 337397 |
| 18 | 1113173 |
| 19 | 1137337 |
| 20 | 2313797 |
| 21 | 2337397 |
| 22 | 11131733 |
| 23 | 12337397 |
| 24 | 11373379 |
| 25 | 33133733 |
| 26 | 111733373 |
| 27 | 113137337 |
| 28 | 123733739 |
| 29 | 291733373 |
| 30 | 113733797 |
| 31 | 1173313373 |
| 32 | 1137333137 |
| 33 | 1237337393 |
| 34 | 1137337973 |
[2,13,23,113,137,373,1973,1733,1373,11317,17333, 31379,37337,113173,211373,313739,337397,1113173, 1137337,2313797,2337397,11131733,12337397, 11373379,33133733,111733373,113137337,123733739, 291733373,113733797,1173313373,1137333137, 1237337393,1137337973] |