Most probably quite a few. However the most obvious is 17*13 = 221.
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221
It is their lowest common multiple which is 221 13 and 17 are both prime numbers
Nothing goes into 13 evenly other than 1 and 13, so that means it is a prime number.
n + 20 - 17 + 13 - n = 20 - 17 + 13 = 3 + 13 = 16
17