924
462,2
231,2,2
77,3,2,2
11,7,3,2,2
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The greatest common factor of 144 , 324 = 36
83 is prime. No tree.
61 is already prime. It doesn't need a tree.
When the bottom branch consists entirely of prime numbers.
145 5,29 Not much of a tree. More like a factor shrub.