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A137075
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Numbers k such that k and k^2 use only the digits 2, 3, 4, 7 and 9.
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1
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2, 3, 7, 27, 223, 473, 4943, 49777, 222327, 273393, 477277, 499423, 499473, 973393, 2733943, 4932923, 4993443, 4994777, 4997927, 49342927, 49924277, 49972927, 49993443, 49994223, 49994777, 97339223, 492942927, 494342927, 497332327, 497794473, 497993923, 499293443, 499932923, 499947327, 499972927, 499979277, 499979327
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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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497242372972927^2 = 247249977479747443472274947329.
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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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