A136916 Numbers k such that k and k^2 use only the digits 0, 2, 5, 7 and 8.

0, 5, 50, 85, 500, 505, 755, 850, 2255, 5000, 5005, 5050, 5085, 7550, 7555, 8500, 8705, 8805, 22550, 22555, 50000, 50005, 50050, 50085, 50500, 50505, 50555, 50850, 72255, 75500, 75550, 75555, 85000, 85005, 87050, 88050, 225500, 225505, 225550, 225555, 228205, 500000, 500005, 500050, 500085, 500500, 500505, 500755, 500850, 505000, 505050, 505550

Offset

1,2

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..1045

J. Wellons, Tables of Shared Digits [archived]

Example

50502750505^2 = 2550527808570277755025.

Mathematica

Module[{c={0, 2, 5, 7, 8}}, Select[FromDigits/@Tuples[c, 6], SubsetQ[ c, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, May 05 2020 *)

Crossrefs

Sequence in context: A136887 A169964 A061474 * A204193 A136919 A136920

Adjacent sequences: A136913 A136914 A136915 * A136917 A136918 A136919

Keyword

base,nonn

Author

Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008

Status

approved