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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 11 |
| 4 | 13 |
| 5 | 17 |
| 6 | 31 |
| 7 | 37 |
| 8 | 71 |
| 9 | 73 |
| 10 | 113 |
| 11 | 131 |
| 12 | 137 |
| 13 | 173 |
| 14 | 311 |
| 15 | 313 |
| 16 | 317 |
| 17 | 331 |
| 18 | 337 |
| 19 | 373 |
| 20 | 733 |
| 21 | 773 |
| 22 | 1117 |
| 23 | 1171 |
| 24 | 1373 |
| 25 | 1733 |
| 26 | 1777 |
| 27 | 3137 |
| 28 | 3313 |
| 29 | 3331 |
| 30 | 3371 |
| 31 | 3373 |
| 32 | 3733 |
| 33 | 7177 |
| 34 | 7331 |
| 35 | 7333 |
| 36 | 7717 |
| 37 | 11113 |
| 38 | 11117 |
| 39 | 11131 |
| 40 | 11171 |
| 41 | 11173 |
| 42 | 11177 |
| 43 | 11311 |
| 44 | 11317 |
| 45 | 11717 |
| 46 | 11731 |
| 47 | 11777 |
[3,7,11,13,17,31,37,71,73,113,131,137,173,311,313, 317,331,337,373,733,773,1117,1171,1373,1733,1777, 3137,3313,3331,3371,3373,3733,7177,7331,7333,7717, 11113,11117,11131,11171,11173,11177,11311,11317, 11717,11731,11777] |