Numbers having four 6's in base 10.

Terms

a(0) =6666a(1) =16666a(2) =26666a(3) =36666a(4) =46666a(5) =56666a(6) =60666a(7) =61666a(8) =62666a(9) =63666a(10) =64666a(11) =65666a(12) =66066a(13) =66166a(14) =66266a(15) =66366a(16) =66466a(17) =66566a(18) =66606a(19) =66616a(20) =66626a(21) =66636a(22) =66646a(23) =66656a(24) =66660a(25) =66661a(26) =66662a(27) =66663a(28) =66664a(29) =66665