1, 3, 7, 21
1, 2, 3, 6, 7, 14, 21, 42
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The common factors of 21 42 and 84 are 21
The composite factors of 42 are: 6, 14, 21, 42.
The common factors of 21, 42, and 56 are: 1 and 7
The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42 The factors of 273 are: 1, 3, 7, 13, 21, 39, 91, 273
The common factors of 42 and 273 are 1, 3, 7 and 21.