Numbers k such that k and k^2 use only the digits 0, 2, 5, 8 and 9.

Terms

a(0) =0a(1) =5a(2) =50a(3) =95a(4) =500a(5) =505a(6) =950a(7) =995a(8) =2255a(9) =5000a(10) =5005a(11) =5050a(12) =5095a(13) =9500a(14) =9950a(15) =9995a(16) =22550a(17) =29255a(18) =50000a(19) =50005a(20) =50050a(21) =50095a(22) =50500a(23) =50555a(24) =50950a(25) =89555a(26) =89905a(27) =90555a(28) =90995a(29) =95000