Numbers k such that (14*10^k - 143)/3 is prime.

Terms

a(0) =2a(1) =4a(2) =5a(3) =11a(4) =23a(5) =27a(6) =28a(7) =60a(8) =114a(9) =154a(10) =160a(11) =194a(12) =412a(13) =417a(14) =769a(15) =1189a(16) =3845a(17) =5381a(18) =10905a(19) =11192a(20) =11630a(21) =19737a(22) =56080a(23) =155740a(24) =259431a(25) =282673