most recent 30 from http://mathoverflow.net 2013-05-25T04:16:23Z http://mathoverflow.net/feeds/user/657 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/879/most-interesting-mathematics-mistake/1034#1034 helvio 2009-10-18T14:02:55Z 2009-10-18T14:02:55Z

<p>William Shanks (1812-1882), who calculated pi to the 707th place, by hand, but it was only correct for the first 527 places.</p>