Numbers n such that 3*4^n - 1 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =9a(4) =17a(5) =19a(6) =32a(7) =38a(8) =47a(9) =103a(10) =108a(11) =153a(12) =162a(13) =229a(14) =235a(15) =637a(16) =1638a(17) =2102a(18) =2567a(19) =6338a(20) =7449a(21) =12845a(22) =20814a(23) =40165a(24) =61815a(25) =77965a(26) =117380a(27) =207420a(28) =351019a(29) =496350