They are 3 times 5 = 15
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This is false. 3 + 4= 7. But two numbers (besides the number itself and 1) times each ather are never prime. This is how we get prime numbers.
5 and 11
It is impossible for the product of two prime numbers to be prime. It is impossible for the sum of two prime numbers to be prime as long as one of the numbers isn't 2.
3 X 41
19 and 11