Problem 1119. sum of non-primes

Created by li jian

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The sum of the non-primes no larger than 10 is 1+4+6+8+9+10=38

Find the sum of all the positive non-prime integers that do not exceed the input, N.

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Last Solution submitted on Sep 15, 2025

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Vincent on 13 Dec 2012

The description of the problem is slightly misleading. It says the sum "below" 10, yet the sum includes 10. It should be ammended to "Find the sum of all the non-primes below the input, and including the input, N.", or something to that effect.

John D'Errico on 22 Feb 2018

I've now fixed the problem statement to be consistent.

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