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

Terms

a(0) =0a(1) =1a(2) =3a(3) =10a(4) =11a(5) =30a(6) =100a(7) =101a(8) =110a(9) =111a(10) =139a(11) =300a(12) =1000a(13) =1001a(14) =1010a(15) =1011a(16) =1100a(17) =1101a(18) =1110a(19) =1390a(20) =3000a(21) =10000a(22) =10001a(23) =10010a(24) =10011a(25) =10100a(26) =10101a(27) =10110a(28) =10111a(29) =10923