Numbers k such that k and k^2 use only the digits 1, 3, 5, 8 and 9.

Terms

a(0) =1a(1) =3a(2) =9a(3) =583a(4) =1833a(5) =3891a(6) =9583a(7) =13833a(8) =93891a(9) =183891a(10) =198391a(11) =559583a(12) =581859a(13) =1839891a(14) =1983391a(15) =1989859a(16) =3133391a(17) =3888333a(18) =9559891a(19) =11811833a(20) =18399891a(21) =19889583a(22) =19983391a(23) =38883333a(24) =39893859a(25) =59931891a(26) =59959583a(27) =198331833a(28) =199953833a(29) =398913391