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document.write('Puzzle of the day from <a href="http://perplexus.info/"><font color="#000066">perplexus.info</font></a>:<br>\n');
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document.write('<b>Niners</b> (Difficulty: 4 of 5)<br>\n');
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document.write('The set of numbers {9, 99, 999, 9999, ...} has some interesting properties. One of these has to do with factorization. Take any number n that isn\'t divisible by 2 or by 5. You will be able to find at least one number in the set that is divisible by n. Furthermore, you won\'t need to look beyond the first n numbers in the set.\n');
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document.write('Prove it. \n');
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document.write('(<i>from <a href="http://www.ocf.berkeley.edu/~wwu/riddles/">http://www.ocf.berkeley.edu/~wwu/riddles/</a>)</i><br><font size="-2">\n');
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document.write('<a href="http://perplexus.info/show.php?pid=231"><font color="#000066">Comments and solution</font></a> | \n');
document.write('<a href="http://perplexus.info/index.php?cid=7"><font color="#000066">More in "<b> Numbers"</b></font></a> | \n');
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