It is their lowest common multiple which is 221
13 and 17 are both prime numbers
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221
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Most probably quite a few. However the most obvious is 17*13 = 221.
Since 2 and 4 go into 8, the only numbers you have to deal with are 8 and 13. Since 13 is prime, the smallest number they will both go into is 8*13 = 104 ■
Nothing goes into 13 evenly other than 1 and 13, so that means it is a prime number.