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A136925
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Numbers k such that k and k^2 use only the digits 0, 2, 7, 8 and 9.
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1
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0, 27, 270, 297, 2700, 2970, 2997, 27000, 28297, 29700, 29970, 29997, 88277, 270000, 282970, 297000, 298027, 299700, 299970, 299997, 882770, 2700000, 2787997, 2829700, 2970000, 2980270, 2997000, 2999700, 2999970, 2999997, 8827700, 9888277, 27000000, 27879970, 27980297, 28297000, 28299827, 29700000, 29802700, 29970000, 29997000
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OFFSET
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1,2
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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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879077927702027^2 = 772778002972890209208899908729.
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MATHEMATICA
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With[{c={0, 2, 7, 8, 9}}, Select[FromDigits/@Tuples[c, 8], SubsetQ[c, IntegerDigits[#^2]]&]] (* Harvey P. Dale, Apr 27 2015 *)
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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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