Numbers k such that k and k^2 use only the digits 2, 4, 5, 6 and 9.

Terms

a(0) =2a(1) =5a(2) =25a(3) =65a(4) =264a(5) =665a(6) =962a(7) =964a(8) =4925a(9) =6665a(10) =22262a(11) =22925a(12) =66665a(13) =96242a(14) =222925a(15) =256242a(16) =494262a(17) =494462a(18) =499262a(19) =499525a(20) =544662a(21) =544665a(22) =666665a(23) =996465a(24) =2225465a(25) =2226262a(26) =2644665a(27) =4946662a(28) =4946665a(29) =4956465