The only common factor of 21 and 26 is 1.
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The common factors of 21 and 51 are: 1 and 3
The common factors of 24 and 26 are: 1 and 2
Common factors of 26 and 44 are: 1 and 2.
The factors of 21 are 1,3,7, and 21. The factors of 70 are 1,2,5,7,14,35, and 70 The common factors of 21 and 70 are 1 and 7.
The common factors of 30 and 21 are 1 and 3.