Numbers k such that 261*2^k+1 is prime.

Terms

a(0) =1a(1) =3a(2) =4a(3) =5a(4) =7a(5) =9a(6) =11a(7) =27a(8) =29a(9) =37a(10) =57a(11) =59a(12) =67a(13) =71a(14) =73a(15) =101a(16) =117a(17) =155a(18) =157a(19) =160a(20) =193a(21) =195a(22) =208a(23) =273a(24) =303a(25) =328a(26) =357a(27) =433a(28) =443a(29) =444