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Never Divides By 5
Problem
Given that $x$ is a positive integer prove that $f(x) = x^2 + x + 1$ will never divide by 5.
Problem ID: 318 (07 Apr 2007) Difficulty: 2 Star
Given that $x$ is a positive integer prove that $f(x) = x^2 + x + 1$ will never divide by 5.
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