The factors of 15 are 3 and 5. The factors of 21 are 3 and 7. So the common factor is 3.
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The factors of 105 are: 1, 3, 5, 7, 15, 21, 35, 105The factors of 147 are: 1, 3, 7, 21, 49, 147The common factors are: 1, 3, 7, 21The Greatest Common Factor (GCF) is: 21
The factors of 105 are:1, 3, 5, 7, 15, 21, 35, 105The factors of 441 are:1, 3, 7, 9, 21, 49, 63, 147, 441The common factors are:1, 3, 7, 21The Greatest Common Factor (GCF) is:21
40 and 21 have no common prime factors
Common factors of 15 and 18 are: 1 and 3.
The factors of 137 are: 1, 137 The factors of 210 are: 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, 210 The common factors are: 1