4 and 8
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A composite number has three or more factors.
17 has no composite factors.
The composite factors of 63 are 9, 21 and 63.
1,2,3,6,7,14,21,42 6,14,21 and 42 are composite.
A composite factor is a factor that is a composite number, as opposed to a prime factor which is a factor that is a prime number.