Here are some numbers whose greatest common factor is 4:
4, 8 (or any pair with 4 and a multiple of 4)
12, 16 (or any other pair of multiples of 4 whose difference is 4)
20, 28
52, 76
92, 104
300, 508
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There are several possibilities of pairs of numbers whose greatest common factor is 18. 54 and 198 18 and 126 414 and 846 72 and 1422
14 and 28 are two even numbers between 10 and 30 whose greatest common factor is 14.
7 and 14
The numbers are 5 and 10.
Relatively prime or co-prime.