Numbers k such that (28*10^k - 43)/3 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =13a(8) =43a(9) =112a(10) =114a(11) =127a(12) =242a(13) =247a(14) =251a(15) =335a(16) =450a(17) =616a(18) =816a(19) =1237a(20) =1448a(21) =4303a(22) =4865a(23) =5414a(24) =6427a(25) =9045a(26) =10391a(27) =12651a(28) =25071a(29) =27901