Least number m > 0 such that 2^m == +-1 (mod 2n + 1).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =3a(5) =5a(6) =6a(7) =4a(8) =4a(9) =9a(10) =6a(11) =11a(12) =10a(13) =9a(14) =14a(15) =5a(16) =5a(17) =12a(18) =18a(19) =12a(20) =10a(21) =7a(22) =12a(23) =23a(24) =21a(25) =8a(26) =26a(27) =20a(28) =9a(29) =29