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Results so far. Here are the (up to) 10 largest factors (of at least 58 digits) found by ECM so far in 2018 (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, 2015, 2016, 2017):

digits factor from B1 sigma date who
69 444391024295554825813920762553875384889500352609895126972409492191251 L(2875) 1e9 2807183577 1st Jul 2018 T. Womack
69 103355115620211675353585153750971964144264746186175815757516694154651 Lucas(4755) 260e6 1:1593024858 28 Sep 2018 H. Bock
68 15417944440203121952250879465115375550405365371906754572834039494521 14398+98143 260e6 9814203009833488824 26 Aug 2018 yoyo@home/[H]auntjemima
67 8801385944588148587153855343468735536920009142571596149280058509737 (2127-1)24-1 260e6 11839839710820506480 12 May 2018 yoyo@home
65 98107727703524978461809065829677822612393113199510243225992694483 276*9276+1 260e6 1:1267584011 3 May 2018 R. Hooft
65 35020442769329876367522852735060830348867981850170604303099578467 34*10229-61 2.9e9 1:3941682105 17 Aug 2018 J. Parker-Burlingham
65 15471197065655512370666917170001167638322438096899011246999107019 143115+115143 260e6 14892940453001293798 24 Aug 2018 yoyo@home/phoenicis
63 339309255680410415657068111365964544508075829804149997978999513 12337-1 1e9 1:2161087723 08 Jul 2018 S. Wagstaff
62 97386481382680278816779064674442001691408659739676965811828871 34*10187-61 850e6 1602514529 30 Jan 2018 J. Parker-Burlingham
61 6179396927983551517277618017008952313623152317523821859582077 34*10268-61 260e6 1:2159663502 26 Sep 2018 J. Parker-Burlingham

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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