Numbers whose base-10 representation has the same nonzero number of 4's and 6's.

Terms

a(0) =46a(1) =64a(2) =146a(3) =164a(4) =246a(5) =264a(6) =346a(7) =364a(8) =406a(9) =416a(10) =426a(11) =436a(12) =456a(13) =460a(14) =461a(15) =462a(16) =463a(17) =465a(18) =467a(19) =468a(20) =469a(21) =476a(22) =486a(23) =496a(24) =546a(25) =564a(26) =604a(27) =614a(28) =624a(29) =634