Numbers k such that k and k^2 use only the digits 2, 5, 6, 8 and 9.

Terms

a(0) =5a(1) =25a(2) =925a(3) =2585a(4) =2925a(5) =22925a(6) =25665a(7) =25865a(8) =28685a(9) =28686a(10) =228685a(11) =256565a(12) =258565a(13) =828665a(14) =925525a(15) =925665a(16) =926565a(17) =962585a(18) =2286685a(19) =2299686a(20) =2925525a(21) =2926925a(22) =9266565a(23) =22866685a(24) =22866925a(25) =22925865a(26) =22955585a(27) =22955665a(28) =25662585a(29) =28686685