Numbers k such that 609 * 10^k - 1 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =12a(7) =17a(8) =43a(9) =46a(10) =50a(11) =88a(12) =110a(13) =187a(14) =472a(15) =832a(16) =834a(17) =1034a(18) =1311a(19) =1700a(20) =2756a(21) =5470a(22) =6124a(23) =7404a(24) =7891a(25) =12010a(26) =16411a(27) =24576a(28) =25461a(29) =27982