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Anonymous
They are: 13+7 = 20
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20 = 2 x 2 x 5
The question does not make sense since 20 and 30 are not prime numbers!
2 x 2 x 5 = 20
The prime factors of 20 are 2x2x5.
The prime numbers of 20 are 2, 2 and 5. (2*2*5 = 20)