The factors of 7 are 1 and 7.
The factors of 21 are 1, 3, 7, and 21.
The only numbers that are factors of BOTH 7 and 21 are 1 and 7.
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The factors of 21 are 1, 3, 7, and 21
factors of 21: 3, 7 prime factors of 21: 3, 7
The factors of 21 are: 1, 3, 7, 21.
The factors of 21: 1, 3, 7, 21.
The factors of 21 are: 1, 3, 7, 21. The factors of 56 are: 1, 2, 4, 7, 8, 14, 28, 56.