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A137001
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Numbers k such that k and k^2 use only the digits 1, 2, 4 and 9.
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0
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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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221911^2 = 49244491921.
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CROSSREFS
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KEYWORD
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base,nonn,more
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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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