420
210,2
105,2,2
35,3,2,2
7,5,3,2,2
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1997 is already prime; no tree.
The prime factorization of 420 is 2, 2, 3, 7, 5.
350=2x5x5x7
194 2 x 97 Since both 2 and 97 are prime numbers, the prime factorization tree is complete.
The prime factorization of 420 is: 2 x 2 x 3 x 5 x 7