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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 7 |
| 3 | 17 |
| 4 | 37 |
| 5 | 47 |
| 6 | 97 |
| 7 | 107 |
| 8 | 227 |
| 9 | 277 |
| 10 | 577 |
| 11 | 587 |
| 12 | 647 |
| 13 | 1367 |
| 14 | 1657 |
| 15 | 1667 |
| 16 | 3457 |
| 17 | 3467 |
| 18 | 3517 |
| 19 | 3527 |
| 20 | 3877 |
| 21 | 10007 |
| 22 | 20747 |
| 23 | 20807 |
| 24 | 21107 |
| 25 | 21157 |
| 26 | 60037 |
| 27 | 124477 |
| 28 | 124847 |
[2,7,17,37,47,97,107,227,277,577,587,647,1367, 1657,1667,3457,3467,3517,3527,3877,10007,20747, 20807,21107,21157,60037,124477,124847] |