Numbers k such that (185*10^k + 7)/3 is prime.

Terms

a(0) =1a(1) =4a(2) =5a(3) =14a(4) =65a(5) =74a(6) =131a(7) =320a(8) =336a(9) =528a(10) =2156a(11) =2370a(12) =2658a(13) =2660a(14) =4940a(15) =6108a(16) =7662a(17) =17813a(18) =20330a(19) =22235a(20) =24600a(21) =26280a(22) =40241a(23) =43936a(24) =72484a(25) =75777a(26) =89063a(27) =166837