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A069575
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Numbers n such that n contains the digit 0 in no base b with 2 < b < n.
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4
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OFFSET
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1,1
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COMMENTS
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Probably finite.
The next term (if it exists) is > 10000000. - Larry Reeves (larryr(AT)acm.org), Oct 12 2003
The next term (if it exists) is > 100000000. - Michel Marcus, Jul 14 2013
The next term (if it exists) is > 10^400. - Nathan Fox, Mar 09 2016
Every term in this sequence other than 4 is prime. - Nathan Fox, Mar 09 2016
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LINKS
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PROG
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(PARI) isok(n) = {for (b=3, n-1, digs = digits(n, b); for (j=1, #digs, if (digs[j] == 0, return (0)); ); ); return (1); } \\ Michel Marcus, Jul 14 2013
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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Corrected by Larry Reeves (larryr(AT)acm.org), Oct 12 2003
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STATUS
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approved
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