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A136839
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Numbers k such that k and k^2 use only the digits 0, 1, 3, 4 and 7.
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1
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0, 1, 10, 100, 1000, 1071, 10000, 10710, 100000, 107100, 174071, 370771, 1000000, 1071000, 1170771, 1740710, 1743771, 3707710, 10000000, 10710000, 11707710, 17334071, 17407100, 17437710, 37077100, 100000000, 100370001, 107100000, 117077100, 133310701, 173340710, 174071000, 174073071, 174377100, 370771000, 374713771, 414017001
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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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414013773134071^2 = 171407404344710010137741033041.
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MATHEMATICA
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With[{c={0, 1, 3, 4, 7}}, Select[FromDigits/@Tuples[c, 9], SubsetQ[ c, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, May 06 2018 *)
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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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