Numbers k such that (38*10^k + 637)/9 is prime.

Terms

a(0) =1a(1) =4a(2) =14a(3) =19a(4) =25a(5) =26a(6) =32a(7) =41a(8) =59a(9) =79a(10) =83a(11) =101a(12) =103a(13) =200a(14) =308a(15) =314a(16) =548a(17) =565a(18) =620a(19) =922a(20) =1102a(21) =1960a(22) =2245a(23) =2254a(24) =5393a(25) =5935a(26) =6227a(27) =14350a(28) =25070