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

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =6a(5) =9a(6) =10a(7) =22a(8) =30a(9) =42a(10) =57a(11) =87a(12) =174a(13) =195a(14) =198a(15) =562a(16) =994a(17) =2421a(18) =2487a(19) =4629a(20) =5838a(21) =13698a(22) =14730a(23) =16966a(24) =25851a(25) =98634a(26) =117222a(27) =192819a(28) =226038a(29) =296115