Prime factors of 42: 2, 3 and 7
Prime factors of 56: 2 and 7
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They are 2 and 7.
It is 70 or 42 that have exactly 3 prime factors
The prime factors of 56 are: 2, 7
The common factors of 21, 42, and 56 are: 1 and 7
The prime factors of 42 are 2, 3, and 7.