Numbers k such that 10^k/8 - 1 is prime.

Terms

a(0) =4a(1) =7a(2) =8a(3) =11a(4) =16a(5) =22a(6) =28a(7) =29a(8) =79a(9) =91a(10) =170a(11) =293a(12) =392a(13) =1898a(14) =2597a(15) =3641a(16) =4099a(17) =8236a(18) =11393a(19) =17969a(20) =18503a(21) =33322