Numbers k with digits 3 and 5 only.

Terms

a(0) =3a(1) =5a(2) =33a(3) =35a(4) =53a(5) =55a(6) =333a(7) =335a(8) =353a(9) =355a(10) =533a(11) =535a(12) =553a(13) =555a(14) =3333a(15) =3335a(16) =3353a(17) =3355a(18) =3533a(19) =3535a(20) =3553a(21) =3555a(22) =5333a(23) =5335a(24) =5353a(25) =5355a(26) =5533a(27) =5535a(28) =5553a(29) =5555