612 18 x 34 6x3 17x2 2x3x3 17x2
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The least common factor of any set of positive integers is 1.
560 280,2 140,2,2 70,2,2,2 35,2,2,2,2 7,5,2,2,2,2
103 is prime, so it's only factors are 1,103
83 is prime. No tree.
61 is already prime. It doesn't need a tree.