Numbers whose base-9 representation has the same nonzero number of 0's and 4's.

Terms

a(0) =36a(1) =85a(2) =117a(3) =166a(4) =198a(5) =247a(6) =279a(7) =325a(8) =326a(9) =327a(10) =329a(11) =330a(12) =331a(13) =332a(14) =333a(15) =342a(16) =351a(17) =369a(18) =378a(19) =387a(20) =396a(21) =409a(22) =441a(23) =490a(24) =522a(25) =571a(26) =603a(27) =652a(28) =684a(29) =742