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A137018
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Numbers k such that k and k^2 use only the digits 1, 2, 7, 8 and 9.
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1
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1, 9, 11, 17, 27, 89, 91, 911, 989, 2777, 2827, 2877, 9911, 27877, 28127, 88189, 88277, 88877, 98989, 99891, 172891, 279127, 282827, 287891, 988877, 2879189, 9989891, 9998891, 29711811, 87919777, 88978189, 99899891, 112818127, 277817777, 277871911, 277987917, 278781777, 279781911, 287919777, 888812811, 1727112877, 2778718989
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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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278787181898989^2 = 77722292791179979928199222121.
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CROSSREFS
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KEYWORD
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base,nonn,changed
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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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