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MathNet 2011 Question 87

Math Olympiad Vault · MathNet 2011

Question 87

Prove that there is no infinite sequence of primes $p_0,p_1,p_2,\ldots$ such that for every positive integer $k$,
$$p_k=2p_{k-1}+1\quad\text{or}\quad p_k=2p_{k-1}-1.$$