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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 2021 (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, 2020):

digits factor from B1 sigma date who
74 29061871024474524652460048148671349817057591121446211165236889497476421553 21429+1 260e6 16049588211814812728 10 Feb 2021 R. Propper
74 25707943518696221194354398472561375355836712931411426198630128562025289803 A(4788,12584) 260e6 1:1625299226 31 Mar 2021 R. Propper
71 32823879912258735727626372991309710431020327877147706439666534226483113 8316+7316 110e6 1:??? 22 Apr 2021 J. Becker
71 11988354452101698103039233924139287094105498100825117049000570758791159 3757+1 1.7e9 1:34498279 19 Jul 2021 S. Wagstaff
70 4702574864356903668328925230483249938419748952832641483390255334999479 5493-1 13e8 1:3612551401 04 Jan 2021 S. Wagstaff
69 683802217606094509460359945174630997716878924606013194220815953901277 22822+1 18e8 1:3838493405 01 Mar 2021 S. Wagstaff
69 457309376061341968858969907539927424797564127673204762828701146483601 22390+1 16e8 1:195128836 09 Jan 2021 S. Wagstaff
69 194038896022637781283943529202525374330942645948410515792534794865319 21393-1 16e8 1:1115269384 25 Mar 2021 S. Wagstaff
67 1162316224302205204133633045083472251018288020441503062949918912461 22570+1 18e8 1:2749941715 18 Feb 2021 S. Wagstaff
67 1014581894481062086635266411284139009925301539055947709872564246847 24283-1 260e6 6655636513802850625 15 Apr 2021 R. Propper

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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