13 and 26, among others.
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286 and 299 have GCF of 13.
If the GCF of two numbers p and q is 7, then the GCF of p2 and q2 is 14.
Prime and relatively prime numbers all have a GCF of 1.
The greatest common factor is the highest number that divides exactly into two or more numbers. 13: 1, 13 39: 1, 3, 13, 39 The GCF for 13 and 39 is 13.
You need at least two numbers to find a GCF.