Numbers k such that 4^k + 3 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =8a(5) =9a(6) =14a(7) =15a(8) =42a(9) =114a(10) =195a(11) =392a(12) =555a(13) =852a(14) =1004a(15) =1185a(16) =2001a(17) =2030a(18) =2031a(19) =2276a(20) =8610a(21) =8967a(22) =10362a(23) =11366a(24) =15927a(25) =16514a(26) =17877a(27) =19122a(28) =19898a(29) =27728