A set of numbers whose GCF is one are called co-prime or relatively prime
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The GCF is 1.
The GCF of 26 and 65 is 13. 13 is a prime number. "Relatively prime" refers to numbers whose GCF is 1.
GCF(83, 100) = 1. The numbers are coprime.
GCF(217, 411) = 1, the numbers are coprime.
GCF(9, 125) = 1: the numbers are coprime.