Numbers whose base-9 representation has the same nonzero number of 4's and 6's.

Terms

a(0) =42a(1) =58a(2) =123a(3) =139a(4) =204a(5) =220a(6) =285a(7) =301a(8) =330a(9) =339a(10) =348a(11) =357a(12) =375a(13) =378a(14) =379a(15) =380a(16) =381a(17) =383a(18) =385a(19) =386a(20) =393a(21) =402a(22) =447a(23) =463a(24) =490a(25) =499a(26) =508a(27) =517a(28) =522a(29) =523