A136911 Numbers k such that k and k^2 use only the digits 0, 2, 5 and 6.

0, 5, 25, 50, 225, 250, 255, 500, 505, 2250, 2500, 2550, 5000, 5005, 5025, 5050, 22500, 25000, 25005, 25025, 25500, 25505, 50000, 50005, 50025, 50050, 50225, 50250, 50255, 50500, 225000, 250000, 250005, 250050, 250250, 255000, 255050, 256255, 500000, 500005, 500025, 500050, 500225, 500250, 500255, 500500, 500505, 502250, 502500, 502550

Offset

1,2

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..1036

J. Wellons, Tables of Shared Digits [archived]

Example

5005050005005^2 = 25050525552600550525050025.

Mathematica

odQ[n_]:=Module[{idn2=IntegerDigits[n^2]}, And@@Table[MemberQ[{0, 2, 5, 6}, idn2[[i]]], {i, Length[idn2]}]]; Union[Flatten[Table[Select[FromDigits/@ Tuples[{0, 2, 5, 6}, d], odQ], {d, 6}]]] (* Harvey P. Dale, Jul 17 2012 *)

Crossrefs

Sequence in context: A290700 A136914 A136913 * A101654 A043106 A147184

Adjacent sequences: A136908 A136909 A136910 * A136912 A136913 A136914

Keyword

base,nonn

Author

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

Status

approved