Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 9.

Terms

a(0) =0a(1) =2a(2) =3a(3) =20a(4) =30a(5) =200a(6) =300a(7) =493a(8) =2000a(9) =3000a(10) =4903a(11) =4930a(12) =4943a(13) =4993a(14) =20000a(15) =30000a(16) =30332a(17) =30403a(18) =49030a(19) =49300a(20) =49430a(21) =49903a(22) =49930a(23) =49943a(24) =49993a(25) =200000a(26) =223393a(27) =300000a(28) =303320a(29) =304030