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| n | a(n) |
|---|---|
| 1 | -1 |
| 2 | 2 |
| 3 | -1 |
| 4 | -1 |
| 5 | 4 |
| 6 | -1 |
| 7 | 5 |
| 8 | -1 |
| 9 | 12 |
| 10 | 19 |
| 11 | -1 |
| 12 | 24 |
| 13 | 32 |
| 14 | 19 |
| 15 | -1 |
| 16 | 20 |
| 17 | -1 |
| 18 | -1 |
| 19 | 20 |
| 20 | -1 |
| 21 | 7 |
| 22 | 57 |
| 23 | -1 |
| 24 | -1 |
| 25 | 6 |
| 26 | 83 |
| 27 | -1 |
| 28 | 15 |
| 29 | 33 |
| 30 | -1 |
| 31 | 38 |
| 32 | 9 |
| 33 | -1 |
| 34 | 23 |
| 35 | 70 |
| 36 | 71 |
| 37 | 57 |
| 38 | 17 |
| 39 | -1 |
| 40 | 26 |
| 41 | -1 |
| 42 | -1 |
| 43 | 28 |
| 44 | -1 |
| 45 | -1 |
| 46 | 56 |
| 47 | 67 |
| 48 | -1 |
| 49 | -1 |
| 50 | 73 |
| 51 | -1 |
| 52 | 75 |
| 53 | -1 |
| 54 | 114 |
| 55 | 177 |
| 56 | 76 |
| 57 | -1 |
| 58 | 137 |
| 59 | -1 |
| 60 | 76 |
| 61 | 29 |
| 62 | 172 |
| 63 | 132 |
| 64 | 87 |
| 65 | 265 |
| 66 | -1 |
| 67 | 52 |
| 68 | 142 |
| 69 | 9 |
| 70 | 76 |
| 71 | -1 |
| 72 | 311 |
| 73 | -1 |
| 74 | 209 |
| 75 | 37 |
| 76 | 149 |
| 77 | 115 |
| 78 | 227 |
| 79 | -1 |
| 80 | 370 |
| 81 | -1 |
| 82 | 333 |
| 83 | -1 |
[-1,2,-1,-1,4,-1,5,-1,12,19,-1,24,32,19,-1,20,-1, -1,20,-1,7,57,-1,-1,6,83,-1,15,33,-1,38,9,-1,23, 70,71,57,17,-1,26,-1,-1,28,-1,-1,56,67,-1,-1,73, -1,75,-1,114,177,76,-1,137,-1,76,29,172,132,87, 265,-1,52,142,9,76,-1,311,-1,209,37,149,115,227, -1,370,-1,333,-1] |