A136910 Numbers k such that k and k^2 use only the digits 0, 2 and 5.

0, 5, 50, 500, 505, 5000, 5005, 5050, 50000, 50005, 50050, 50500, 500000, 500005, 500050, 500500, 500505, 505000, 5000000, 5000005, 5000050, 5000500, 5000505, 5005000, 5005050, 5050000, 5050005, 50000000, 50000005, 50000050, 50000500, 50000505, 50005000, 50005005, 50005050, 50050000, 50050500, 50500000, 50500005, 50500050, 500000000

Offset

1,2

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..446

J. Wellons, Tables of Shared Digits [archived]

Example

505000500500005^2 = 255025505505255550255005000025.

Mathematica

Select[FromDigits/@Tuples[{0, 2, 5}, 9], SubsetQ[{0, 2, 5}, IntegerDigits[ #^2]]&] (* Harvey P. Dale, May 30 2019 *)

Crossrefs

Sequence in context: A299868 A136915 A136918 * A267663 A093143 A346937

Adjacent sequences: A136907 A136908 A136909 * A136911 A136912 A136913

Keyword

base,nonn

Author

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

Status

approved