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Mathematics 13 Online
OpenStudy (vishal_kothari):

Let n  5 be an integer. Show that n is prime if and only if for every decomposition n = n1 +n2 +n3 +n4, where 1  n1  n2  n3  n4 and each ni is an integer, we have n1n4 6= n2n3.

OpenStudy (vishal_kothari):

anyone...

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