They are 1 and 3.
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The Greatest Common Factor of 13, 39, 26 is 13.
It is: 13
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.
The factors of 39 are 1, 3, 13, and 39
The GCF is 13.