Numbers whose base-10 representation has the same nonzero number of 0's and 6's.

Terms

a(0) =60a(1) =106a(2) =160a(3) =206a(4) =260a(5) =306a(6) =360a(7) =406a(8) =460a(9) =506a(10) =560a(11) =601a(12) =602a(13) =603a(14) =604a(15) =605a(16) =607a(17) =608a(18) =609a(19) =610a(20) =620a(21) =630a(22) =640a(23) =650a(24) =670a(25) =680a(26) =690a(27) =706a(28) =760a(29) =806