Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 8.

Terms

a(0) =0a(1) =2a(2) =20a(3) =22a(4) =48a(5) =200a(6) =202a(7) =220a(8) =480a(9) =482a(10) =2000a(11) =2002a(12) =2020a(13) =2022a(14) =2200a(15) =2202a(16) =2832a(17) =4482a(18) =4800a(19) =4820a(20) =4832a(21) =20000a(22) =20002a(23) =20020a(24) =20022a(25) =20200a(26) =20220a(27) =20838a(28) =22000a(29) =22002