Answer: (5 & 37), (11 & 31), (13 & 29), (19 & 23)
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19 and 23
42 has three prime factors: 2, 3 and 7
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.
Some odd numbers can be written as the sum of prime numbers. 2 + 3 = 5
2 and 3.