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Results so far. Here are the (up to) 10 largest factors (of at least 60 digits) found by ECM so far in 2020 (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, 2018, 2019):

digits factor from B1 sigma date who
74 64870540947465605764324669088253119952192728965411231802881677906820342861 3785+1 1.7e9 1:4245037118 07 Aug 2020 S. Wagstaff
69 742294492322737640765835058587725517897783468628162904847821734425391 11281+7281 260e6 1:1066342235 16 Mar 2020 R. Propper
67 2133853262669464326609494890084969873852117020264697439564525923033 52428747+1 850e6 11812172473002880345 24 Apr 2020 yoyo@home/Ben
67 1881941120468249708169539576246651193369513480043229827729929343069 31842+21842 110e6 1:2166799276 11 Jun 2020 R. Balfour
67 1562692644172831910698894852204981908438761422548517899695476786511 22953-1 850e6 6071148668037578423 01 Feb 2020 R. Propper
67 1018841800924329930671590370281656384822482863478547057611324020601 4460+3460 260e6 1:3352090683 17 Mar 2020 R. Propper
67 1017427293854259988038024275612197407393617272662943703343053137541 529*9529-1 260e6 1390343457692451768 09 Jul 2020 yoyo@home/nenym
66 906533749251005245151122204670351312590267105760052002862150546121 10337-1 1.2e9 1:2288012419 20 Feb 2020 S. Wagstaff
65 20126633732856273272993747262506300132661729108094476327117047969 22749-1 850e6 4817957806046605670 28 Jan 2020 R. Propper
65 10783519111876599782570681731617294711255159689732908342971391267 867*12867-1 260e6 9454560319835557099 13 Jan 2020 yoyo@home/Crashtest

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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