Numbers k such that k and k^2 use only the digits 1, 3, 4, 5 and 8.

Terms

a(0) =1a(1) =38a(2) =188a(3) =1188a(4) =18388a(5) =58188a(6) =135438a(7) =185888a(8) =334388a(9) =381888a(10) =1145188a(11) =1831538a(12) =3334388a(13) =3338141a(14) =3338388a(15) =3441141a(16) =5843388a(17) =18855188a(18) =33338388a(19) =33344438a(20) =38151188a(21) =185433388a(22) =185558188a(23) =185844438a(24) =185854388a(25) =333344438a(26) =338841141a(27) =385155188a(28) =1153881888a(29) =1155185888