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News:

Results so far. Here are the (up to) 10 largest factors found by ECM so far this year (see also the all-times top-50 table, and the top ten from 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014):

digits factor from B1 sigma date who
7134121014034583126200398354894744777158420594210915713150400130023849773A(7392,1357)110e6224330071514 Jul 2015Ch. Clavier
681423599590775863189253169771594475093187225940484438096351285055218911334+1450e6248303689025 Apr 2015S. Wagstaff
6726063244933035320536082894305280640748217227301673009199909852396233671-1400e6311299334928 Jan 2015B. Dodson
6637440462302411876899340652364830698608196553323888170831202141815111325+1400e6212541726322 Feb 2015B. Dodson
66328901132858783171390858305141371274552384634441377796365452500599c160 (*)850e632680239374 July 2015A. Booker
662905682684396145983783795758592343512617465989740221345447262117096397+1400e668970354824 Jun 2015B. Dodson
66171392487475854562743889929898648257427965285180928044372842369069412*5412+1110e6169382385518 Jan 2015R. Hooft
6537504436845167700736669220801216994818138202219325645301730547801c262 (*)850e6229107091321 Jul 2015A. Booker
64220058516286576271928980830593429400471560430518849581653206752313859+591381e9353057106926 Mar 2015R. Propper
641073192258264324424086852900288836216163541516862922957554660159c184 (*)850e6215435071602 Jul 2015A. Booker

(*) from Euclid-Mullin graph

ECMNET Newsletters: number 1 (13 Feb 1998), number 2 (15 Mar 1998), number 3 (17 Apr 1998), number 4 (15 May 1998), number 5 (18 June 1998), number 6 (15 July 1998), number 7 (17 August 1998), number 8 (17 September 1998), number 9 (16 October 1998), number 10 (23 November 1998), number 11 (17 December 1998), number 12 (19 April 1999), number 13 (16 December 1999).


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