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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 3 |
| 3 | 5 |
| 4 | 3 |
| 5 | 3 |
| 6 | 5 |
| 7 | -1 |
| 8 | 5 |
| 9 | 5 |
| 10 | -1 |
| 11 | 3 |
| 12 | 7 |
| 13 | -1 |
| 14 | 3 |
| 15 | 13 |
| 16 | -1 |
| 17 | 5 |
| 18 | 5 |
| 19 | -1 |
| 20 | 7 |
| 21 | 23 |
| 22 | -1 |
| 23 | 13 |
| 24 | 5 |
| 25 | -1 |
| 26 | 7 |
| 27 | 5 |
| 28 | -1 |
| 29 | 59 |
| 30 | 29 |
| 31 | 3 |
| 32 | 3 |
| 33 | 5 |
| 34 | -1 |
| 35 | 3 |
| 36 | 5 |
| 37 | -1 |
| 38 | 13 |
| 39 | 11 |
| 40 | -1 |
| 41 | 37 |
| 42 | 23 |
| 43 | -1 |
| 44 | 43 |
| 45 | 11 |
| 46 | -1 |
| 47 | 3 |
| 48 | 5 |
| 49 | -1 |
| 50 | 11 |
| 51 | 5 |
| 52 | -1 |
| 53 | 5 |
| 54 | 19 |
| 55 | -1 |
| 56 | 5 |
| 57 | 43 |
| 58 | -1 |
| 59 | 13 |
| 60 | 29 |
| 61 | -1 |
| 62 | 7 |
| 63 | 19 |
| 64 | -1 |
| 65 | 41 |
| 66 | 47 |
| 67 | -1 |
| 68 | 13 |
| 69 | 11 |
| 70 | 3 |
| 71 | 7 |
| 72 | 5 |
| 73 | -1 |
| 74 | 29 |
| 75 | 7 |
| 76 | -1 |
| 77 | 79 |
| 78 | 13 |
| 79 | 3 |
| 80 | 3 |
[3,3,5,3,3,5,-1,5,5,-1,3,7,-1,3,13,-1,5,5,-1,7,23, -1,13,5,-1,7,5,-1,59,29,3,3,5,-1,3,5,-1,13,11,-1, 37,23,-1,43,11,-1,3,5,-1,11,5,-1,5,19,-1,5,43,-1, 13,29,-1,7,19,-1,41,47,-1,13,11,3,7,5,-1,29,7,-1, 79,13,3,3] |