Numbers k such that 5*10^k - 51 is prime.

Terms

a(0) =2a(1) =6a(2) =13a(3) =108a(4) =142a(5) =190a(6) =241a(7) =274a(8) =284a(9) =498a(10) =985a(11) =1068a(12) =2197a(13) =2302a(14) =2588a(15) =3934a(16) =6577a(17) =8820a(18) =15364a(19) =25022a(20) =42533a(21) =65086