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A137114
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Numbers k such that k and k^2 use only the digits 2, 5, 6, 8 and 9.
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1
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5, 25, 925, 2585, 2925, 22925, 25665, 25865, 28685, 28686, 228685, 256565, 258565, 828665, 925525, 925665, 926565, 962585, 2286685, 2299686, 2925525, 2926925, 9266565, 22866685, 22866925, 22925865, 22955585, 22955665, 25662585, 28686685, 29266925, 29296585, 29825865, 29882585, 29926565, 82882585, 92566565, 92895565, 96259685
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OFFSET
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1,1
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COMMENTS
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Generated with DrScheme.
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LINKS
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EXAMPLE
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829629856598686^2 = 688285698959956296296856926596.
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MATHEMATICA
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Module[{c={2, 5, 6, 8, 9}}, Table[Select[FromDigits/@Tuples[c, n], SubsetQ[ c, IntegerDigits[#^2]]&], {n, 8}]]//Flatten (* Harvey P. Dale, Oct 21 2016 *)
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
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STATUS
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approved
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