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08-29-11, 01:10 PM
Alessandro Freda found a P62 to finish 853^73-1. This is an unusually large find for B1=11e6, optimal for finding 45 digit factors. This is just shy of the 63 digits currently needed for the 10 largest ECM factors this year, but makes the list of 50 largest ECM factors ever. It is both a Brent composite and a Mishima Cyclotomic Number.
More... (http://www.rechenkraft.net/yoyo/all_news.php#183)
More... (http://www.rechenkraft.net/yoyo/all_news.php#183)