Numbers k for which 10*2^k + 3 is a prime (giving terms of A068712).

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =6a(6) =7a(7) =10a(8) =11a(9) =17a(10) =19a(11) =25a(12) =27a(13) =31a(14) =33a(15) =42a(16) =43a(17) =49a(18) =51a(19) =57a(20) =64a(21) =65a(22) =106a(23) =139a(24) =196a(25) =273a(26) =279a(27) =379a(28) =392a(29) =505