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A136827
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Numbers k such that k and k^2 use only the digits 0, 1, 2 and 6.
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3
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0, 1, 10, 11, 100, 101, 110, 1000, 1001, 1010, 1011, 1100, 1101, 10000, 10001, 10010, 10011, 10100, 10110, 11000, 11001, 11010, 100000, 100001, 100010, 100011, 100100, 100101, 100110, 101000, 101001, 101100, 110000, 110001, 110010, 110100, 1000000, 1000001, 1000010, 1000011, 1000100, 1000101, 1000110, 1001000, 1001010, 1001100, 1010000
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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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101001020100101^2 = 10201206061261006216060210201.
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MATHEMATICA
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With[{c={0, 1, 2, 6}}, Select[FromDigits/@Tuples[c, 7], SubsetQ[c, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, Jul 04 2019 *)
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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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