Factorization: 3*3*5*5*7
It is: 3*3*5*5*7 = 1575
32*52*7 = 1575
1997 is already prime; no tree.
It is: 3^2 times 5^2 times 7^1 = 1575
51 3,17
350=2x5x5x7
33 11,3
a prime factorization tree
50 25,2 5,5,2
97 is already prime; no tree.
131 is already prime. No tree.
141 = 3 x 47
572=2x286=2x2x143=2x2x11x13