Numbers k such that 10*k + 1 is prime.

Terms

a(0) =1a(1) =3a(2) =4a(3) =6a(4) =7a(5) =10a(6) =13a(7) =15a(8) =18a(9) =19a(10) =21a(11) =24a(12) =25a(13) =27a(14) =28a(15) =31a(16) =33a(17) =40a(18) =42a(19) =43a(20) =46a(21) =49a(22) =52a(23) =54a(24) =57a(25) =60a(26) =63a(27) =64a(28) =66a(29) =69