Numbers k such that 2*10^k - 51 is prime.

Terms

a(0) =2a(1) =3a(2) =4a(3) =8a(4) =11a(5) =13a(6) =17a(7) =28a(8) =56a(9) =105a(10) =231a(11) =339a(12) =643a(13) =922a(14) =1219a(15) =1880a(16) =2209a(17) =4238a(18) =4987a(19) =14770a(20) =56194a(21) =67043a(22) =96867a(23) =124751