Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 6.

Terms

a(0) =0a(1) =2a(2) =5a(3) =20a(4) =25a(5) =45a(6) =50a(7) =65a(8) =200a(9) =205a(10) =225a(11) =245a(12) =250a(13) =255a(14) =450a(15) =500a(16) =502a(17) =505a(18) =650a(19) =665a(20) =2000a(21) =2005a(22) =2050a(23) =2065a(24) =2242a(25) =2245a(26) =2250a(27) =2450a(28) =2500a(29) =2502