168 = 2 x 2 x 2 x 3 x 7
a prime factorization tree
23 x 3 x 7 = 168
168 84,2 42,2,2 21,2,2,2 7,3,2,2,2
612 306,2 153,2,2 51,3,2,2 17,3,3,2,2
96 48,2 24,2,2 12,2,2,2 6,2,2,2,2 3,2,2,2,2,2
the prime factorization of 168 is: 2squared x 2 x 3 x 7
1997 is already prime; no tree.
2x2x2x3x7
2x3x4x7
51 3,17
350=2x5x5x7
33 11,3
a prime factorization tree
A and 168 have no common factors other than one.
23 x 3 x 7 = 168
50 25,2 5,5,2
97 is already prime; no tree.