Numbers k such that 3*6^k - 1 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =5a(5) =6a(6) =9a(7) =12a(8) =13a(9) =24a(10) =41a(11) =71a(12) =140a(13) =189a(14) =190a(15) =630a(16) =713a(17) =1066a(18) =1173a(19) =1202a(20) =1271a(21) =1520a(22) =1606a(23) =2091a(24) =2162a(25) =2547a(26) =6253a(27) =7284a(28) =8676a(29) =10735