Numbers whose base-8 representation has the same nonzero number of 5's and 7's.

Terms

a(0) =47a(1) =61a(2) =111a(3) =125a(4) =175a(5) =189a(6) =239a(7) =253a(8) =303a(9) =317a(10) =327a(11) =335a(12) =343a(13) =351a(14) =359a(15) =375a(16) =376a(17) =377a(18) =378a(19) =379a(20) =380a(21) =382a(22) =431a(23) =445a(24) =453a(25) =461a(26) =469a(27) =477a(28) =485a(29) =488