Factors of 15 are: 1 3 5 and 15 of which 3 and 5 are prime factors
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The Prime Factors of 15 are 3, 5
The prime factors are: 3, 5. So, 3 x 5 = 15
The factors of 15 are: 1, 3, 5, and 15.The prime factors of 15 are: 3 and 5.The factors of 21 are: 1, 3, 7, and 21.The prime factors of 21 are: 3 and 7.
The factors of 15 are: 1, 3, 5, and 15.The prime factors of 15 are: 3 and 5.The factors of 20 are: 1, 2, 4, 5, 10, and 20.The prime factors of 20 are: 2 and 5.
23 is already prime; it doesn't need a tree.