1, 3, 7 and 21.
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The factors of 21 are: 1, 3, 7, 21 | The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, 40
As factors, 1 and -1
Factros of 21: 1, 3, 7, 21 Factors of 32: 1, 2, 4, 8, 16, 32
1,2 1,2,4
The factors of 28 are: 1, 2, 4, 7, 14, 28 The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42 The factors of 63 are: 1, 3, 7, 9, 21, 63