Numbers k such that 8*3^k - 1 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =10a(5) =17a(6) =50a(7) =170a(8) =184a(9) =194a(10) =209a(11) =641a(12) =1298a(13) =4034a(14) =5956a(15) =7154a(16) =9970a(17) =35956a(18) =42730a(19) =132004a(20) =190610