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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 7 |
| 3 | 557 |
| 4 | 577 |
| 5 | 587 |
| 6 | 757 |
| 7 | 787 |
| 8 | 857 |
| 9 | 877 |
| 10 | 887 |
| 11 | 5557 |
| 12 | 5857 |
| 13 | 7577 |
| 14 | 7757 |
| 15 | 7877 |
| 16 | 8887 |
| 17 | 55787 |
| 18 | 57557 |
| 19 | 57587 |
| 20 | 57787 |
| 21 | 58757 |
| 22 | 58787 |
| 23 | 75557 |
| 24 | 75577 |
| 25 | 75787 |
| 26 | 77557 |
| 27 | 77587 |
| 28 | 78577 |
| 29 | 78787 |
| 30 | 78857 |
| 31 | 78877 |
| 32 | 78887 |
| 33 | 85577 |
| 34 | 87557 |
| 35 | 87587 |
| 36 | 87877 |
| 37 | 87887 |
| 38 | 555557 |
| 39 | 555857 |
| 40 | 557857 |
| 41 | 558587 |
[5,7,557,577,587,757,787,857,877,887,5557,5857, 7577,7757,7877,8887,55787,57557,57587,57787,58757, 58787,75557,75577,75787,77557,77587,78577,78787, 78857,78877,78887,85577,87557,87587,87877,87887, 555557,555857,557857,558587] |