Numbers n with digits 3 and 6 only.

Terms

a(0) =3a(1) =6a(2) =33a(3) =36a(4) =63a(5) =66a(6) =333a(7) =336a(8) =363a(9) =366a(10) =633a(11) =636a(12) =663a(13) =666a(14) =3333a(15) =3336a(16) =3363a(17) =3366a(18) =3633a(19) =3636a(20) =3663a(21) =3666a(22) =6333a(23) =6336a(24) =6363a(25) =6366a(26) =6633a(27) =6636a(28) =6663a(29) =6666