Numbers k such that 6^k - 7 is prime.

Terms

a(0) =2a(1) =4a(2) =6a(3) =8a(4) =9a(5) =10a(6) =15a(7) =20a(8) =46a(9) =49a(10) =61a(11) =98a(12) =110a(13) =144a(14) =266a(15) =344a(16) =978a(17) =1692a(18) =1880a(19) =1924a(20) =3142a(21) =3220a(22) =4209a(23) =5708a(24) =7064a(25) =13465a(26) =13858a(27) =19474a(28) =22666a(29) =26807