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A136911 Numbers k such that k and k^2 use only the digits 0, 2, 5 and 6. 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Generated with DrScheme.
LINKS
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
KEYWORD
base,nonn
AUTHOR
Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
STATUS
approved

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Last modified May 20 23:09 EDT 2024. Contains 372720 sequences. (Running on oeis4.)