Numbers k such that (598*10^k - 31)/9 is prime.

Terms

a(0) =1a(1) =4a(2) =5a(3) =7a(4) =16a(5) =17a(6) =19a(7) =28a(8) =59a(9) =68a(10) =128a(11) =307a(12) =343a(13) =368a(14) =421a(15) =448a(16) =469a(17) =691a(18) =1949a(19) =2506a(20) =4868a(21) =6914a(22) =30025a(23) =30955a(24) =35522a(25) =43388a(26) =45716a(27) =49999a(28) =76309a(29) =80149