Numbers k such that 281*2^k + 1 is prime.

Terms

a(0) =1a(1) =7a(2) =9a(3) =11a(4) =33a(5) =81a(6) =113a(7) =143a(8) =185a(9) =227a(10) =359a(11) =393a(12) =631a(13) =1123a(14) =1273a(15) =1351a(16) =3721a(17) =4753a(18) =6617a(19) =9281a(20) =12539a(21) =12961a(22) =19513a(23) =23497a(24) =29695a(25) =33361a(26) =88153a(27) =150751a(28) =448129a(29) =456377