42

This number is a composite.

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42 divides the sum of digits of the first 42 prime numbers, i.e., 42 divides (2 + 3 + 5 + 7 + 1+1 + … + 1+7+9 + 1+8+1) or 378. Can you find the first prime with this property? See PC71. [Honaker]

Submitted: 2020-11-16 11:21:44;   Last Modified: 2020-11-26 09:21:43.
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