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10/16/2007

April 13–April 20, 2010

Problem

Find the smallest positive integer n such that the following 73 fractions are in their reduced form:

Solution

here

List of solvers

Congpa You, Lloyd Sakazaki, Peiyush Jain, James Pfeiffer, Jonathan Cross, Jens Malmquist, Jason Shaw, Preetum Nakkiran, Dou Kaya, Kevin Sonnanburg, Byron Kilbourne, Gary Mager, David Lingenbrink.

Gary Mager wins the prize!