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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 13 |
| 4 | 17 |
| 5 | 177 |
| 6 | 1777 |
| 7 | 3937 |
| 8 | 5537 |
| 9 | 5573 |
| 10 | 15173 |
| 11 | 55377 |
| 12 | 55733 |
| 13 | 79137 |
| 14 | 135173 |
| 15 | 195937 |
| 16 | 339173 |
| 17 | 377777 |
| 18 | 399377 |
| 19 | 791377 |
| 20 | 3397973 |
| 21 | 5199137 |
| 22 | 7913777 |
| 23 | 13535137 |
| 24 | 17397537 |
| 25 | 33993973 |
| 26 | 37735377 |
| 27 | 39993777 |
| 28 | 59591173 |
| 29 | 59919137 |
| 30 | 79971937 |
| 31 | 135157537 |
| 32 | 139713973 |
| 33 | 153177777 |
[1,5,13,17,177,1777,3937,5537,5573,15173,55377, 55733,79137,135173,195937,339173,377777,399377, 791377,3397973,5199137,7913777,13535137,17397537, 33993973,37735377,39993777,59591173,59919137, 79971937,135157537,139713973,153177777] |