Numbers whose base-9 representation has the same nonzero number of 0's and 7's.

Terms

a(0) =63a(1) =88a(2) =144a(3) =169a(4) =225a(5) =250a(6) =306a(7) =331a(8) =387a(9) =412a(10) =468a(11) =493a(12) =549a(13) =568a(14) =569a(15) =570a(16) =571a(17) =572a(18) =573a(19) =575a(20) =576a(21) =585a(22) =594a(23) =603a(24) =612a(25) =621a(26) =639a(27) =655a(28) =711a(29) =745