1, 13
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No, 13 is not a factor of 45.
The GCF (Greatest Common Factor) of 13 and 26 is: 13
The only common factor of 13 and 42 is 1, since 13 is prime and 42 is not a multiple of 13.
The greatest common factor of the numbers 39, 13 and 26 is 13.
The greatest common factor of 65 and 91 is 13.The GCF is 13.