Order of n (mod 7).

Terms

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