Numbers k such that (728*10^k - 71)/9 is prime.

Terms

a(0) =0a(1) =2a(2) =5a(3) =6a(4) =11a(5) =14a(6) =41a(7) =47a(8) =51a(9) =84a(10) =164a(11) =228a(12) =293a(13) =1178a(14) =1212a(15) =1292a(16) =2099a(17) =2694a(18) =4446a(19) =7382a(20) =13638a(21) =39428a(22) =40971