Squares composed of digits {2,4,5}.

Terms

a(0) =4a(1) =25a(2) =225a(3) =4225a(4) =55225a(5) =442225a(6) =4545424a(7) =5452225a(8) =42445225a(9) =44422225a(10) =544522225a(11) =2224254244a(12) =4424245225a(13) =4444222225a(14) =4554225225a(15) =54445222225a(16) =55255554225a(17) =444242245225a(18) =444442222225