Numbers k such that k and k^2 use only the digits 2, 4, 5, 6 and 8.

Terms

a(0) =2a(1) =5a(2) =8a(3) =22a(4) =25a(5) =65a(6) =68a(7) =242a(8) =258a(9) =262a(10) =665a(11) =668a(12) =828a(13) =2585a(14) =2868a(15) =6665a(16) =6668a(17) =8284a(18) =24262a(19) =25465a(20) =25622a(21) =25668a(22) =26242a(23) =65465a(24) =65485a(25) =66665a(26) =66668a(27) =242662a(28) =254222a(29) =254665