The GCF of any set of prime numbers is 1.
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73 is a prime number so 51,3x17 and 73 only have the number 1 as the greatest common factor.
The greatest common factor of two or more prime numbers is 1.
As the numbers are all prime, the only factors each of them has are 1 and the number itself. Therefore the greatest, and only, common factor of two of more prime numbers is 1.
You need at least two numbers to find a GCF.
No for example the GCF of 24 and 36 is 12 which is a composite number