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It is: 3*71 = 213
3 x 71 = 213
1997 is already prime; no tree.
3 x 71
51 3,17
a prime factorization tree
33 11,3
350=2x5x5x7
50 25,2 5,5,2
844 422,2 211,2,2
99_11_9_3_3 so prime factorization is 11x3x3
97 is already prime; no tree.
131 is already prime. No tree.