Name a pair of factors that are both prime numbers and have a product of 21

First you need to make a list of prime numbers that can only be divisible by 1 and itself.
here are examples of prime numbers: 1, 3, 5, 7, 9++
once you have a list of the prime numbers just pick all of them that add up to 21.
for example : a number divisible by only itself and one + another number divisible only by itself and one = 21

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