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A077376
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Squarefree numbers whose internal digits form a squarefree number.
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4
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122, 123, 127, 129, 130, 131, 133, 134, 137, 138, 139, 151, 154, 155, 157, 158, 159, 161, 163, 165, 166, 167, 170, 173, 174, 177, 178, 179, 221, 222, 223, 226, 227, 229, 230, 231, 233, 235, 237, 238, 239, 251, 253, 254, 255, 257, 258, 259, 262, 263, 265, 266
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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COMMENTS
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LINKS
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MATHEMATICA
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sf2Q[n_]:=Module[{c=FromDigits[Most[Rest[IntegerDigits[n]]]]}, c!=1&&SquareFreeQ[ n]&&SquareFreeQ[c]]; Select[Range[100, 300], sf2Q] (* Harvey P. Dale, Jul 22 2012 *)
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CROSSREFS
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KEYWORD
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base,easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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