Question 87
Prove that there is no infinite sequence of primes $p_0,p_1,p_2,\ldots$ such that for every positive integer $k$,
$$p_k=2p_{k-1}+1\quad\text{or}\quad p_k=2p_{k-1}-1.$$
$$p_k=2p_{k-1}+1\quad\text{or}\quad p_k=2p_{k-1}-1.$$
Math Olympiad Vault · MathNet 2011