Numbers k such that 7^k + 6^(k-1) is prime.

Terms

a(0) =3a(1) =4a(2) =8a(3) =9a(4) =16a(5) =25a(6) =33a(7) =40a(8) =116a(9) =201a(10) =208a(11) =504a(12) =579a(13) =964a(14) =1060a(15) =1160a(16) =1508a(17) =1969a(18) =4615a(19) =7311a(20) =65964a(21) =83121a(22) =87396