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A137028
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Numbers k such that k and k^2 use only the digits 1, 3, 4, 7 and 8.
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3
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1, 38, 88, 1188, 4141, 8878, 11478, 18471, 33878, 183878, 844878, 887771, 1347141, 3381378, 33883878, 43344878, 88811471, 177317438, 178374141, 333374141, 338841141, 344743878, 844877141, 887377438, 3334348188, 3441183188, 8817473471, 11483831378, 13347183878, 13371137378, 13484747378, 17713783188, 17744811471
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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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344787487347378^2 = 118878411431318344438843474884.
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MATHEMATICA
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Module[{c={1, 3, 4, 7, 8}}, Table[Select[FromDigits/@Tuples[c, n], SubsetQ[c, IntegerDigits[#^2]]&], {n, 11}]]//Flatten (* Harvey P. Dale, Feb 22 2024 *)
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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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