Numbers whose base-7 representation has the same nonzero number of 4's and 6's.

Terms

a(0) =34a(1) =46a(2) =83a(3) =95a(4) =132a(5) =144a(6) =181a(7) =193a(8) =202a(9) =209a(10) =216a(11) =223a(12) =237a(13) =238a(14) =239a(15) =240a(16) =241a(17) =243a(18) =279a(19) =291a(20) =298a(21) =305a(22) =312a(23) =319a(24) =322a(25) =323a(26) =324a(27) =325a(28) =327a(29) =333