# 4

This number is a composite.

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There are 4 known positive integers n such that the sum of
all primes smaller or equal to n divides n(n+1)/2. This sum
also divides the sum of all nonprimes smaller or equal to
n. Note that 4 is the smallest positive integer with this
property. [Capelle]
Submitted: 2009-08-11 06:04:27; Last Modified: 2009-08-11 12:16:02.

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