Numbers k such that k^2 contains only digits {2,5,9}.

Terms

a(0) =3a(1) =5a(2) =15a(3) =23a(4) =77a(5) =173a(6) =235a(7) =315a(8) =1515a(9) =2435a(10) =7227a(11) =23515a(12) =54335a(13) =97773a(14) =243515a(15) =2435077a(16) =3090673a(17) =72497765a(18) =74533585a(19) =9639636523