42

This number is a composite.

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42 is the smallest number k that is equal to the sum of the nonprime proper divisors of k, i.e., 42 = 1 + 6 + 14 + 21. Integers with this property are the product of a perfect number and a Carol prime. [Honaker]

Submitted: 2020-01-26 08:57:30;   Last Modified: 2022-11-22 11:22:45.
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