Numbers k such that (493*10^k - 7)/9 is prime.

Terms

a(0) =1a(1) =2a(2) =5a(3) =7a(4) =8a(5) =14a(6) =19a(7) =22a(8) =23a(9) =31a(10) =62a(11) =65a(12) =79a(13) =178a(14) =356a(15) =401a(16) =517a(17) =557a(18) =1040a(19) =2248a(20) =6718a(21) =10730a(22) =15079a(23) =24938a(24) =36241a(25) =58486a(26) =69340