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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
76 5191873720703506118777751448022113902214321958414685694699686672326450173651 175175+176176 260e6 896958136 27 May 2018 Ryan P.
69 444391024295554825813920762553875384889500352609895126972409492191251 L(2875) 1e9 2807183577 1st Jul 2018 T. Womack
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
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 1189185777673768464216852029408188362424066650143483192051761 3677+1 1e9 1:24998675 6 May 2018 S. Wagstaff
59 89889606269073901082901578436277965983883967076039535258233 10388+1 7e8 1:4155635103 30 Jun 2018 S. Wagstaff
58 1015795485009910558877802407870941315114871334143994803197 591*9591-1 11e6 ??? 12 Jul 2018 P. Leyland
56 13511343345592021540532368355487578496800124905875639501 11250+6250 1e9 1887536245 7 Jul 2018 B. Silverman

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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