Order of 4 mod 4n-1.

Terms

a(0) =1a(1) =3a(2) =5a(3) =2a(4) =9a(5) =11a(6) =9a(7) =5a(8) =6a(9) =6a(10) =7a(11) =23a(12) =4a(13) =10a(14) =29a(15) =3a(16) =33a(17) =35a(18) =10a(19) =39a(20) =41a(21) =14a(22) =6a(23) =18a(24) =15a(25) =51a(26) =53a(27) =18a(28) =22a(29) =12