“…In fact, there is a very great probability for appearing of primes of the form 2x 2 -1, because there are 44 x-values less 100 i.e. x=2, 3,4,6,7,8,10,11,13,15,17,18,21,22,24,25,28,34,36,38,39,41,42,45,46,49,50,52,56,59,62,63,64,69,73,76,80,81,85,87,91,92,95,98 to generate primes of the form 2x 2 -1. More such primes can be viewed in the on-line Encyclopedia of Integer Sequences.…”