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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 23 |
| 6 | 223 |
| 7 | 227 |
| 8 | 353 |
| 9 | 2333 |
| 10 | 2777 |
| 11 | 3323 |
| 12 | 7727 |
| 13 | 27527 |
| 14 | 33377 |
| 15 | 33773 |
| 16 | 35537 |
| 17 | 35573 |
| 18 | 35753 |
| 19 | 37337 |
| 20 | 52727 |
| 21 | 53777 |
| 22 | 55337 |
| 23 | 55373 |
| 24 | 55733 |
| 25 | 57557 |
| 26 | 57737 |
| 27 | 57773 |
| 28 | 73553 |
| 29 | 73757 |
| 30 | 75227 |
| 31 | 75353 |
| 32 | 75377 |
| 33 | 75533 |
| 34 | 75557 |
| 35 | 75773 |
| 36 | 77573 |
| 37 | 222557 |
| 38 | 222773 |
[2,3,5,7,23,223,227,353,2333,2777,3323,7727,27527, 33377,33773,35537,35573,35753,37337,52727,53777, 55337,55373,55733,57557,57737,57773,73553,73757, 75227,75353,75377,75533,75557,75773,77573,222557, 222773] |