1260
630,2
315,2,2
105,3,2,2
35,3,3,2,2
7,5,3,3,2,2
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1260 630,2 315,2,2 105,3,2,2 35,3,3,2,2 7,5,3,3,2,2
90. how did you get 90?
83 is prime. No tree.
HCF(30, 36, 42) = 6 LCM(30, 36, 42) = 1260
61 is already prime. It doesn't need a tree.