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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 1 |
| 3 | 3 |
| 4 | -1 |
| 5 | 12 |
| 6 | 1 |
| 7 | 30 |
| 8 | 1 |
| 9 | 35 |
| 10 | -1 |
| 11 | 56 |
| 12 | 1 |
| 13 | 90 |
| 14 | 1 |
| 15 | 99 |
| 16 | -1 |
| 17 | 132 |
| 18 | 1 |
| 19 | 182 |
| 20 | 1 |
| 21 | 195 |
| 22 | -1 |
| 23 | 240 |
| 24 | 1 |
| 25 | 306 |
| 26 | 1 |
| 27 | 323 |
| 28 | -1 |
| 29 | 380 |
| 30 | 1 |
| 31 | 462 |
| 32 | 1 |
| 33 | 483 |
| 34 | -1 |
| 35 | 552 |
| 36 | 1 |
| 37 | 650 |
| 38 | 1 |
| 39 | 675 |
| 40 | -1 |
| 41 | 756 |
| 42 | 1 |
| 43 | 870 |
| 44 | 1 |
| 45 | 899 |
| 46 | -1 |
| 47 | 992 |
| 48 | 1 |
| 49 | 1122 |
| 50 | 1 |
| 51 | 1155 |
| 52 | -1 |
| 53 | 1260 |
[2,1,3,-1,12,1,30,1,35,-1,56,1,90,1,99,-1,132,1, 182,1,195,-1,240,1,306,1,323,-1,380,1,462,1,483, -1,552,1,650,1,675,-1,756,1,870,1,899,-1,992,1, 1122,1,1155,-1,1260] |