Numbers k such that k and k^2 use only the digits 2, 3, 5, 7 and 9.

Terms

a(0) =3a(1) =5a(2) =23a(3) =27a(4) =73a(5) =77a(6) =235a(7) =523a(8) =527a(9) =577a(10) =723a(11) =773a(12) =5223a(13) =5723a(14) =5773a(15) =5777a(16) =7227a(17) =27527a(18) =57927a(19) =72335a(20) =75723a(21) =97773a(22) =232227a(23) =232335a(24) =239227a(25) =239573a(26) =522235a(27) =597773a(28) =727527a(29) =757227