They are 2 and 7.
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Prime factors of 42: 2, 3 and 7 Prime factors of 56: 2 and 7
The common factors of 21, 42, and 56 are: 1 and 7
It is 70 or 42 that have exactly 3 prime factors
The prime factors of 56 are: 2, 7
Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42.Factors of 56: 1, 2, 4, 7, 8, 14, 28, 56.Factors of 70: 1, 2, 5, 7, 10, 14, 35, 70.GCF (42, 56, 70) = 14