Numbers k such that 157*2^k-1 is prime.

Terms

a(0) =1a(1) =5a(2) =33a(3) =97a(4) =121a(5) =125a(6) =305a(7) =445a(8) =473a(9) =513a(10) =1581a(11) =3077a(12) =3517a(13) =6345a(14) =8797a(15) =15265a(16) =16641a(17) =32185a(18) =32581a(19) =43905a(20) =77025a(21) =84377a(22) =202345a(23) =230777a(24) =234401a(25) =473073a(26) =802321a(27) =869073