Question

If $2^n+1$ is prime, then must $n$ be prime?

   If $2^n+1$ is prime, then must $n$ be prime?

Applied Algebra: Codes, Ciphers and Discrete Algorithms

Applied Algebra: Codes, Ciphers and Discrete Algorithms

Darel W. Hardy, Fred… 2nd Edition

Chapter 1, Problem 20

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We need to determine if $n$ must be a prime number whenever $2^n + 1$ is a prime number. Show more…

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If $2^n+1$ is prime, then must $n$ be prime?

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