A136917 Numbers k such that k and k^2 use only the digits 0, 2, 5, 7 and 9.

0, 5, 27, 50, 77, 95, 270, 500, 505, 527, 755, 770, 950, 995, 2700, 2755, 5000, 5005, 5027, 5050, 5077, 5095, 5205, 5270, 7227, 7550, 7700, 9500, 9950, 9995, 22577, 27000, 27005, 27550, 50000, 50005, 50027, 50050, 50077, 50095, 50270, 50500, 50505, 50527, 50705, 50770, 50950, 52050, 52700, 72270, 75500, 77000, 77005, 95000, 95005, 97505, 99500

Offset

1,2

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..1561

J. Wellons, Tables of Shared Digits [archived]

Example

52527097505^2 = 2759095972299777225025.

Mathematica

With[{c={0, 2, 5, 7, 9}, digs=5}, Select[FromDigits/@Tuples[ c, digs], SubsetQ[ c, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, Sep 29 2018 *)

Crossrefs

Sequence in context: A058490 A299578 A308829 * A181890 A048712 A121876

Adjacent sequences: A136914 A136915 A136916 * A136918 A136919 A136920

Keyword

base,nonn

Author

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

Status

approved