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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 37 |
| 4 | 73 |
| 5 | 307 |
| 6 | 337 |
| 7 | 373 |
| 8 | 733 |
| 9 | 773 |
| 10 | 3037 |
| 11 | 3307 |
| 12 | 3373 |
| 13 | 3733 |
| 14 | 7307 |
| 15 | 7333 |
| 16 | 7703 |
| 17 | 30307 |
| 18 | 30703 |
| 19 | 30707 |
| 20 | 30773 |
| 21 | 33037 |
| 22 | 33073 |
| 23 | 33377 |
| 24 | 33703 |
| 25 | 33773 |
| 26 | 37003 |
| 27 | 37307 |
| 28 | 37337 |
| 29 | 70003 |
| 30 | 70373 |
| 31 | 73037 |
| 32 | 73303 |
| 33 | 77003 |
| 34 | 77377 |
| 35 | 77773 |
| 36 | 300007 |
| 37 | 300073 |
| 38 | 300733 |
| 39 | 303007 |
| 40 | 303073 |
| 41 | 303307 |
[3,7,37,73,307,337,373,733,773,3037,3307,3373, 3733,7307,7333,7703,30307,30703,30707,30773,33037, 33073,33377,33703,33773,37003,37307,37337,70003, 70373,73037,73303,77003,77377,77773,300007,300073, 300733,303007,303073,303307] |