Numbers k such that (2*10^k - 179)/3 is prime.

Terms

a(0) =2a(1) =3a(2) =4a(3) =6a(4) =9a(5) =25a(6) =162a(7) =258a(8) =457a(9) =813a(10) =1079a(11) =1266a(12) =2397a(13) =4075a(14) =15688a(15) =18663a(16) =21079a(17) =21851a(18) =40627a(19) =54960