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13 is a Prime number, that means that no two whole numbers can be multiplied other than 1 and 13 to result in 13. so to answer your question, the only common factor these two numbers have is the number 1.
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The GCF (Greatest Common Factor) of 13 and 26 is: 13
The greatest common factor of the numbers 39, 13 and 26 is 13.
The GCF is 1.
The greatest common factor of 65 and 91 is 13.The GCF is 13.
The greatest common factor (GCF) is 1.