42 = 1 x 2 x 3 x 7
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The prime numbers (factors) of 42 are: 2,3,7
The prime factors of 42 are 2, 3 and 7
The prime factors of 42 are 2, 3, and 7. These prime numbers multiplied create 42.2*3*7 = 422 x 3 x 7 = 42.
To work this out, you first have to split the numbers down into their prime factors: 42 = 2x3x7 23 = 23 There are no common prime factors. This means that the only common factor of 42 and 23 is 1.
It is 70 or 42 that have exactly 3 prime factors