Numbers k such that (206*10^k - 17)/9 is prime.

Terms

a(0) =1a(1) =2a(2) =4a(3) =5a(4) =11a(5) =16a(6) =23a(7) =193a(8) =217a(9) =412a(10) =413a(11) =2662a(12) =4388a(13) =5383a(14) =6391a(15) =7847a(16) =12698a(17) =14369a(18) =16358a(19) =20345a(20) =28483a(21) =75073a(22) =79268a(23) =100189a(24) =116687