| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | -1 |
| 2 | 2684 |
| 3 | 505 |
| 4 | 22 |
| 5 | -1 |
| 6 | 109 |
| 7 | 5000005 |
| 8 | -1 |
| 9 | -1 |
| 10 | -1 |
| 11 | -1 |
| 12 | 101 |
| 13 | -1 |
| 14 | -1 |
| 15 | 50005 |
| 16 | -1 |
| 17 | -1 |
| 18 | -1 |
| 19 | -1 |
| 20 | 20000 |
| 21 | -1 |
| 22 | -1 |
| 23 | -1 |
| 24 | 100012 |
| 25 | -1 |
| 26 | -1 |
| 27 | -1 |
| 28 | 4999449 |
| 29 | -1 |
| 30 | -1 |
| 31 | 5000000000000000000000000000005 |
| 32 | -1 |
[0,-1,2684,505,22,-1,109,5000005,-1,-1,-1,-1,101, -1,-1,50005,-1,-1,-1,-1,20000,-1,-1,-1,100012,-1, -1,-1,4999449,-1,-1, 5000000000000000000000000000005,-1] |