Numbers k such that 2^(2k-1) == 2 (mod 2k) and such that 2^(k-1) != 1 (mod k).

Terms

a(0) =15a(1) =85a(2) =91a(3) =435a(4) =451a(5) =703a(6) =1247a(7) =1271a(8) =1581a(9) =1695a(10) =1891a(11) =2071a(12) =3133a(13) =3367a(14) =3683a(15) =4795a(16) =4859a(17) =5551a(18) =6643a(19) =8695a(20) =9061a(21) =9131a(22) =9211a(23) =9605a(24) =9919a(25) =12403a(26) =13019a(27) =14351a(28) =14701a(29) =15051