Numbers k such that (229*10^k - 1)/3 is prime.

Terms

a(0) =3a(1) =6a(2) =8a(3) =9a(4) =10a(5) =17a(6) =27a(7) =28a(8) =45a(9) =81a(10) =83a(11) =225a(12) =246a(13) =1732a(14) =2957a(15) =3021a(16) =5459a(17) =5702a(18) =5740a(19) =7924a(20) =15110a(21) =18683a(22) =25149a(23) =46968a(24) =48944a(25) =49571a(26) =70122a(27) =147699a(28) =158339