360
180,2
90,2,2
45,2,2,2
15,3,2,2,2
5,3,3,2,2,2
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It is: 2*2*2*3*3*5 = 360
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.