The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42.
The proper factors are 1, 2, 3, 6, 7, 14, and 21
or 2, 3, 6, 7, 14, and 21 if the number 1 is excluded as it is in some definitions of proper factor.
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2, 3, 6, 7, 14, 21
the factors of 42 are 1,42,6,7,2,21,3,14
The factors of 42 are 1,2,3,6,7,14,21,42. The factors of 66 are 1,2,3,6,11,22,33,66
Factors of 18: 1,2,3,6,9,18 Factors of 42: 1,2,3,6,7,14,21,42 Factors of both: 1,2,3,6
If you delete the 1, the rest of the numbers are the set of proper factors of 588.