Numbers whose set of base-6 digits is {1,3}.

Terms

a(0) =1a(1) =3a(2) =7a(3) =9a(4) =19a(5) =21a(6) =43a(7) =45a(8) =55a(9) =57a(10) =115a(11) =117a(12) =127a(13) =129a(14) =259a(15) =261a(16) =271a(17) =273a(18) =331a(19) =333a(20) =343a(21) =345a(22) =691a(23) =693a(24) =703a(25) =705a(26) =763a(27) =765a(28) =775a(29) =777