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A137071
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Numbers k such that k and k^2 use only the digits 2, 3, 4, 6 and 7.
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1
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2, 6, 26, 474, 4762, 272442, 273376, 2732632, 2764674, 27264326, 27337662, 47374332, 2724422442, 2724642442, 2763643326, 4727236262, 4737376662, 4737746644, 4772247662, 4772446262, 27247472662, 27326246426, 47246633344, 47362667432, 47377466632, 47673344474, 272463477632, 272623776426, 273363264674, 276337233762
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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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473737632374332^2 = 224427344327637734663772446224.
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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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