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It can be: 3*17 = 51 or 1*51 = 51
9 does.
25
(21,3)(9,7)
36
How about: 3 times 49 equals 147
56 x 2
1x52, 2x26, 3x13
2 x 13
17 x 5
100 x 10
6 x 9
8 x 2