Numbers whose base-11 representation has the same nonzero number of 4's and 5's.

Terms

a(0) =49a(1) =59a(2) =170a(3) =180a(4) =291a(5) =301a(6) =412a(7) =422a(8) =489a(9) =500a(10) =511a(11) =522a(12) =539a(13) =540a(14) =541a(15) =542a(16) =545a(17) =546a(18) =547a(19) =548a(20) =549a(21) =555a(22) =566a(23) =577a(24) =588a(25) =599a(26) =609a(27) =620a(28) =631a(29) =642