A Mersenne prime is a prime number of the form 2^n-1; for instance, 7 = 2^3-1.www.ddhw.com Prove that if 2^n-1 is a prime then 2^n+1 is not a prime, and if 2^n+1 then 2^n-1 is not a prime for n>2. Is there a name for the primes of the form 2^n+1? www.ddhw.com
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