None, Prime numbers are only equally divisible by themselves and one
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2 x 2 x 2 x 3 = 24
19 and 5 are prime numbers and 19+5 = 24
In prime numbers 19+5 = 24 or as a product of its prime factors 2*2*2*3 = 24
As 13 is prime and is not a factor of 24, then they are relatively prime
3 will go into both of these numbers