Numbers whose base-9 representation has the same nonzero number of 4's and 5's.

Terms

a(0) =41a(1) =49a(2) =122a(3) =130a(4) =203a(5) =211a(6) =284a(7) =292a(8) =329a(9) =338a(10) =347a(11) =356a(12) =369a(13) =370a(14) =371a(15) =372a(16) =375a(17) =376a(18) =377a(19) =383a(20) =392a(21) =401a(22) =409a(23) =418a(24) =427a(25) =436a(26) =441a(27) =442a(28) =443a(29) =444