Numbers k such that (3^k - 7)/2 is prime.

Terms

a(0) =4a(1) =12a(2) =18a(3) =26a(4) =106a(5) =164a(6) =246a(7) =956a(8) =2554a(9) =3350a(10) =6496a(11) =8706a(12) =9008a(13) =15398a(14) =15490a(15) =20408a(16) =39240a(17) =41060a(18) =41842a(19) =58358a(20) =60346a(21) =82214a(22) =134972a(23) =194014a(24) =344204a(25) =587712a(26) =778070