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 A137003 Numbers k such that k and k^2 use only the digits 1, 2, 5 and 6. 1
 1, 5, 11, 15, 16, 25, 125, 511, 515, 516, 1125, 2261, 5125, 12511, 12515, 25525, 51211, 125125, 5162515, 51626211, 125162515, 5162525125 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Generated with DrScheme. Subsequence of A137004 and A137007. - M. F. Hasler, Jan 24 2008 LINKS J. Wellons, Tables of Shared Digits EXAMPLE 5162525125^2 = 26651665666256265625. MATHEMATICA okQ[n_]:=With[{idn=IntegerDigits[n^2]}, And@@Table[MemberQ[{1, 2, 5, 6}, idn[[i]]], {i, Length[idn]}]]; Flatten[Table[Select[ FromDigits/@ Tuples[{1, 2, 5, 6}, k], okQ], {k, 10}]] (* Harvey P. Dale, Jul 07 2012 *) CROSSREFS Sequence in context: A137004 A137005 A137006 * A314003 A314004 A296031 Adjacent sequences:  A137000 A137001 A137002 * A137004 A137005 A137006 KEYWORD base,nonn AUTHOR Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008 STATUS approved

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Last modified January 22 05:19 EST 2022. Contains 350481 sequences. (Running on oeis4.)