Numbers k such that k and k^2 use only the digits 3, 5, 6, 8 and 9.

Terms

a(0) =3a(1) =6a(2) =63a(3) =83a(4) =583a(5) =833a(6) =836a(7) =8366a(8) =59656a(9) =83666a(10) =96886a(11) =98336a(12) =8356666a(13) =83386963a(14) =83585883a(15) =96893686a(16) =596563956a(17) =599986366a(18) =833885883a(19) =835663566a(20) =836563566a(21) =836633333a(22) =966366333a(23) =969535383a(24) =5999696956a(25) =8356833333a(26) =8366339663a(27) =9689368586a(28) =9689989656a(29) =59693966663