2205
735,3
245,3,3
49,5,3,3
7,7,5,3,3
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The greatest common factor of 288 and 405 is 9.
The GCF/HCF of 486 and 405 is 81.
83 is prime. No tree.
61 is already prime. It doesn't need a tree.
When the bottom branch consists entirely of prime numbers.