The common factors of 13 and 52 are: 1 and 13
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Since 13 is a Prime number, and is not a factor of 72, the only common integer factor of 13 and 72 is 1.
4 is the GCF of 52 and 72 because 52 = 4 times 13 and 4 divides 72 but 13 does not.
The common factors of 13 and 39 are: 1 and 13
Since 18 is a factor of 72, all of its factors are common.
Since 13 is a factor of 39, all of its factors are common.
The common factors are: 1, 3, 9