Numbers whose base-10 representation has the same nonzero number of 0's and 9's.

Terms

a(0) =90a(1) =109a(2) =190a(3) =209a(4) =290a(5) =309a(6) =390a(7) =409a(8) =490a(9) =509a(10) =590a(11) =609a(12) =690a(13) =709a(14) =790a(15) =809a(16) =890a(17) =901a(18) =902a(19) =903a(20) =904a(21) =905a(22) =906a(23) =907a(24) =908a(25) =910a(26) =920a(27) =930a(28) =940a(29) =950