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The common factors of 35 and 91 are 1 and 7.
The factors of 91 are:1, 7, 13, 91The factors of 156 are:1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156The common factors are:1, 13
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The Prime Factor of 81 is 3The Prime Factors of 28 are 2, 7
7 and 13 share no common factors aside from 1.