Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 8.

Terms

a(0) =0a(1) =2a(2) =5a(3) =20a(4) =22a(5) =45a(6) =50a(7) =200a(8) =202a(9) =205a(10) =220a(11) =450a(12) =500a(13) =502a(14) =505a(15) =2000a(16) =2002a(17) =2005a(18) =2020a(19) =2022a(20) =2050a(21) =2200a(22) =2202a(23) =2245a(24) =2255a(25) =4500a(26) =4522a(27) =5000a(28) =5002a(29) =5005