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A136876
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Numbers k such that k and k^2 use only the digits 0, 1, 6, 7 and 8.
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1
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0, 1, 10, 100, 881, 1000, 8776, 8810, 10000, 10801, 87760, 88100, 88776, 100000, 108010, 877600, 881000, 887760, 1000000, 1008001, 1077776, 1080100, 7866881, 8776000, 8810000, 8877600, 10000000, 10080010, 10777760, 10801000, 78668810, 81778181, 87760000, 88100000, 88776000, 100000000, 100080001, 100800100, 107777600, 108010000
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OFFSET
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1,3
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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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108660810680801^2 = 11807171777808876681110001601.
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MATHEMATICA
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With[{c={0, 1, 6, 7, 8}}, Select[FromDigits/@Tuples[c, 9], SubsetQ[c, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, Mar 10 2017 *)
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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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