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a^4 + 4 is not a prime number.

Source: Polish MO second round 1958 p1

August 29, 2024
primenumber theoryprime numbers

Problem Statement

Prove that if a a is an integer different from 1 1 and āˆ’1 - 1 , then a4+4 a^4 + 4 is not a prime number.
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