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A136828
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Numbers k such that k and k^2 use only the digits 0, 1, 2, 6 and 7.
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1
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0, 1, 10, 11, 26, 100, 101, 110, 260, 276, 776, 1000, 1001, 1010, 1011, 1100, 1101, 2600, 2760, 2776, 7760, 10000, 10001, 10010, 10011, 10100, 10110, 10776, 11000, 11001, 11010, 11076, 26000, 27600, 27760, 77600, 100000, 100001, 100010, 100011, 100100, 100101, 100110, 101000, 101001, 101100, 107760, 110000, 110001, 110010, 110100, 110760, 161761
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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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1662107161761^2 = 2762600217177207020621121.
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MATHEMATICA
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Module[{c={0, 1, 2, 6, 7}, nn=6}, Select[FromDigits/@Tuples[c, nn], SubsetQ[ c, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, Jun 21 2022 *)
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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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