Prime values of n for which n*2^k + 1 is composite for all positive integers k.

Terms

a(0) =271129a(1) =322523a(2) =327739a(3) =482719a(4) =934909a(5) =1639459a(6) =2131043a(7) =2131099a(8) =2576089a(9) =3098059a(10) =3608251a(11) =4573999a(12) =6678713a(13) =6799831a(14) =7523281a(15) =7761437a(16) =8184977a(17) =8840599a(18) =8879993a(19) =8959163a(20) =9208337a(21) =9252323a(22) =9930469a(23) =9937637a(24) =10192733a(25) =10306187a(26) =10391933a(27) =11206501