Numbers whose base-10 representation has the same nonzero number of 2's and 9's.

Terms

a(0) =29a(1) =92a(2) =129a(3) =192a(4) =209a(5) =219a(6) =239a(7) =249a(8) =259a(9) =269a(10) =279a(11) =289a(12) =290a(13) =291a(14) =293a(15) =294a(16) =295a(17) =296a(18) =297a(19) =298a(20) =329a(21) =392a(22) =429a(23) =492a(24) =529a(25) =592a(26) =629a(27) =692a(28) =729a(29) =792