Numbers k such that 5*2^k + 3 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =7a(6) =8a(7) =11a(8) =12a(9) =18a(10) =20a(11) =26a(12) =28a(13) =32a(14) =34a(15) =43a(16) =44a(17) =50a(18) =52a(19) =58a(20) =65a(21) =66a(22) =107a(23) =140a(24) =197a(25) =274a(26) =280a(27) =380a(28) =393a(29) =506