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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 37 |
| 4 | 73 |
| 5 | 79 |
| 6 | 97 |
| 7 | 337 |
| 8 | 373 |
| 9 | 379 |
| 10 | 397 |
| 11 | 733 |
| 12 | 739 |
| 13 | 773 |
| 14 | 797 |
| 15 | 937 |
| 16 | 977 |
| 17 | 997 |
| 18 | 3373 |
| 19 | 3733 |
| 20 | 3739 |
| 21 | 3779 |
| 22 | 3793 |
| 23 | 3797 |
| 24 | 7333 |
| 25 | 7393 |
| 26 | 7793 |
| 27 | 7933 |
| 28 | 7937 |
| 29 | 7993 |
| 30 | 9337 |
| 31 | 9377 |
| 32 | 9397 |
| 33 | 9733 |
| 34 | 9739 |
| 35 | 9973 |
| 36 | 33377 |
| 37 | 33739 |
| 38 | 33773 |
| 39 | 33797 |
| 40 | 33937 |
| 41 | 33997 |
| 42 | 37337 |
| 43 | 37339 |
| 44 | 37379 |
| 45 | 37397 |
[3,7,37,73,79,97,337,373,379,397,733,739,773,797, 937,977,997,3373,3733,3739,3779,3793,3797,7333, 7393,7793,7933,7937,7993,9337,9377,9397,9733,9739, 9973,33377,33739,33773,33797,33937,33997,37337, 37339,37379,37397] |