Order of n (mod 9).

Terms

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