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A077377
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Squarefree numbers whose external digits form a squarefree number.
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6
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1, 2, 3, 5, 6, 7, 10, 11, 13, 14, 15, 17, 19, 21, 22, 23, 26, 29, 30, 31, 33, 34, 35, 37, 38, 39, 41, 42, 43, 46, 47, 51, 53, 55, 57, 58, 59, 61, 62, 65, 66, 67, 69, 70, 71, 73, 74, 77, 78, 79, 82, 83, 85, 86, 87, 89, 91, 93, 94, 95, 97, 101, 103, 105, 107, 109, 110, 111, 113
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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PROG
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(PARI) list(lim)=my(v=List(), n, t); for(d=0, logint(lim\=1, 10), t=10^d; forsquarefree(k=t, min(10*t-1, lim), if(issquarefree(k[1]\t*10 + k[1]%10), listput(v, k[1])))); Vec(v) \\ Charles R Greathouse IV, Feb 14 2018
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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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