Numbers n such that (n-1)^2-1 divides 2^(n-1)-1.

Terms

a(0) =1a(1) =3a(2) =5a(3) =17a(4) =37a(5) =257a(6) =457a(7) =1297a(8) =2557a(9) =4357a(10) =6481a(11) =8009a(12) =11953a(13) =26321a(14) =44101a(15) =47521a(16) =47881a(17) =49681a(18) =57241a(19) =65537a(20) =74449a(21) =84421a(22) =97813a(23) =141157a(24) =157081a(25) =165601a(26) =225457a(27) =278497a(28) =310591a(29) =333433