0,2

Searched up to 7742*2^100000 + 1 (3871*2^100001 + 1 is the format in the Yves Gallot's Proth Program)

Y. Gallot, Proth.exe: Windows Program for Finding Large Primes

a(n) = least integer b greater than a(n-1) such that a(n-1)*2^b + 1 is prime

Sequence in context: A007311 A031345 A114625 this_sequence A097799 A005629 A028304

Adjacent sequences: A046805 A046806 A046807 this_sequence A046809 A046810 A046811

hard,nonn

Chad Davis (cad16(AT)po.cwru.edu)