13 is a Prime number & 27 = 3*3*3*1, so the greatest common factor of 13 and 27 would be 1, which is the only common factor.
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the greatest common factor for 27 and 32 is 1
The greatest common factor of 27 and 35 is 1
The greatest common factor of 75 and 27 is 3.
The greatest common factor (GCF) of 27 and 33 is 3
Since 3 is a factor of 27, it is automatically the GCF of 3 and 27