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A136986
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Numbers k such that k and k^2 use only the digits 1, 2 and 4.
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1
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OFFSET
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1,2
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COMMENTS
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Sequence terminates.
Generated with DrScheme.
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LINKS
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EXAMPLE
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21^2 = 441.
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MATHEMATICA
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Table[Select[(FromDigits/@Tuples[{1, 2, 4}, d]), SubsetQ[{1, 2, 4}, IntegerDigits[ #^2]]&], {d, 2}]//Flatten (* Harvey P. Dale, Jan 10 2022 *)
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CROSSREFS
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KEYWORD
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base,fini,full,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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