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Purple Comet 2009 MS Question 2

Source:

July 28, 2011

Problem Statement

Let p1=2,p2=3,p3=5...p_1 = 2, p_2 = 3, p_3 = 5 ... be the sequence of prime numbers. Find the least positive even integer nn so that p1+p2+p3+...+pnp_1 + p_2 + p_3 + ... + p_n is not prime.
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