Numbers k such that k and k^2 use only the digits 2, 4, 5, 8 and 9.

Terms

a(0) =2a(1) =5a(2) =22a(3) =222a(4) =288a(5) =49522a(6) =49828a(7) =229888a(8) =495222a(9) =499228a(10) =499522a(11) =992585a(12) =2292585a(13) =2298882a(14) =2448522a(15) =2924522a(16) =4944282a(17) =4988485a(18) =4989888a(19) =4995222a(20) =4995282a(21) =4998485a(22) =9449828a(23) =9929222a(24) =22259828a(25) =29825485a(26) =49425585a(27) =49449828a(28) =49824522a(29) =49858228