Numbers k such that 4^k + 27 is prime.

Terms

a(0) =1a(1) =2a(2) =4a(3) =5a(4) =7a(5) =8a(6) =20a(7) =22a(8) =43a(9) =55a(10) =67a(11) =77a(12) =92a(13) =97a(14) =154a(15) =160a(16) =533a(17) =748a(18) =1432a(19) =3143a(20) =6427a(21) =8257a(22) =8270a(23) =9623a(24) =12269a(25) =28822a(26) =32683a(27) =42638a(28) =97427a(29) =133340