Numbers with digits 3 and 9 only.

Terms

a(0) =3a(1) =9a(2) =33a(3) =39a(4) =93a(5) =99a(6) =333a(7) =339a(8) =393a(9) =399a(10) =933a(11) =939a(12) =993a(13) =999a(14) =3333a(15) =3339a(16) =3393a(17) =3399a(18) =3933a(19) =3939a(20) =3993a(21) =3999a(22) =9333a(23) =9339a(24) =9393a(25) =9399a(26) =9933a(27) =9939a(28) =9993a(29) =9999