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replaced http://mathoverflow.net/ with https://mathoverflow.net/

edited Apr 13, 2017 at 12:58

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Proved by grobber (Alexandru Chirvasitu) on AoPS: http://www.artofproblemsolving.com/Forum/viewtopic.php?f=61&t=157732

EDIT: Also, http://www.artofproblemsolving.com/Forum/viewtopic.php?f=38&t=335001 might contain a solution (posts #4, #7 and #8).

answered Sep 3, 2011 at 22:58

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