Numbers k such that k and k^2 use only the digits 0, 1, 3, 8 and 9.

Terms

a(0) =0a(1) =1a(2) =3a(3) =9a(4) =10a(5) =30a(6) =33a(7) =90a(8) =99a(9) =100a(10) =109a(11) =300a(12) =303a(13) =330a(14) =333a(15) =900a(16) =901a(17) =990a(18) =999a(19) =1000a(20) =1009a(21) =1090a(22) =3000a(23) =3003a(24) =3030a(25) =3033a(26) =3300a(27) =3303a(28) =3330a(29) =3333