Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 9.

Terms

a(0) =0a(1) =2a(2) =5a(3) =20a(4) =45a(5) =50a(6) =95a(7) =200a(8) =205a(9) =450a(10) =495a(11) =500a(12) =502a(13) =505a(14) =950a(15) =995a(16) =2000a(17) =2005a(18) =2050a(19) =2245a(20) =4495a(21) =4500a(22) =4505a(23) =4905a(24) =4950a(25) =4955a(26) =4995a(27) =5000a(28) =5002a(29) =5005