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

Terms

a(0) =0a(1) =1a(2) =3a(3) =5a(4) =7a(5) =15a(6) =45a(7) =95a(8) =235a(9) =463a(10) =733a(11) =1437a(12) =1583a(13) =1677a(14) =1803a(15) =4163a(16) =4765a(17) =9219a(18) =9959a(19) =25477a(20) =26059a(21) =41539a(22) =54195a(23) =65057a(24) =74977a(25) =116589a(26) =192289a(27) =311835a(28) =350767a(29) =353635