328 = 2 x 2 x 2 x 41 OR 23 x 41
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The prime factor tree of 280 is:140,270,2,235,2,2,27,5,2,2,2
factor trees and prime factor trees are the same thing with different names.
the prime factor of 5
281 is prime. No tree.
The bottom branch of a factor tree consists entirely of prime numbers.