Numbers k such that 9*10^k + 89 is prime.

Terms

a(0) =1a(1) =4a(2) =5a(3) =7a(4) =9a(5) =15a(6) =26a(7) =43a(8) =75a(9) =106a(10) =129a(11) =141a(12) =147a(13) =171a(14) =351a(15) =512a(16) =927a(17) =1156a(18) =2563a(19) =2689a(20) =3274a(21) =4211a(22) =5709a(23) =6908a(24) =11781a(25) =14464a(26) =31451a(27) =34921a(28) =36635a(29) =38087