Numbers k such that 4^k - 5 is prime.

Terms

a(0) =2a(1) =3a(2) =4a(3) =5a(4) =6a(5) =9a(6) =10a(7) =13a(8) =16a(9) =18a(10) =28a(11) =33a(12) =59a(13) =65a(14) =75a(15) =83a(16) =103a(17) =113a(18) =275a(19) =353a(20) =405a(21) =568a(22) =614a(23) =909a(24) =1184a(25) =1200a(26) =1564a(27) =2266a(28) =2556a(29) =4246