351
3, 117
3, 3, 39
3, 3, 3, 13
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There is no "common factor" of 350, to have a common factor you must have more than one number, so there is no common factor of 350.
83 is prime. No tree.
61 is already prime. It doesn't need a tree.
When the bottom branch consists entirely of prime numbers.
The Greatest Common Factor (GCF) is: 10