most recent 30 from http://mathoverflow.net 2010-03-16T21:33:14Z http://mathoverflow.net/feeds/question/7045 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/7045/how-find-a-variable-value-in-mod-expression chiaotzu 2009-11-28T12:57:38Z 2009-11-28T14:03:28Z

<p>9 = 2^X mod 11</p> <p>What is X and how do you find X?</p>

http://mathoverflow.net/questions/7045/how-find-a-variable-value-in-mod-expression/7050#7050 Mike 2009-11-28T14:03:28Z 2009-11-28T14:03:28Z

<p>Although this smells, walks and talks like homework, a good starter could be to read <a href="http://en.wikipedia.org/wiki/Discrete%5Flogarithm" rel="nofollow">http://en.wikipedia.org/wiki/Discrete_logarithm</a> (For you particular example, try to think how many $X$ you would have to try until you can be sure to have checked all possibilities.)</p>