Results so far. Here are the (up to) 10 largest factors (of at least 60 digits) found by ECM so far in 2026 (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, 2021, 2022, 2023, 2024, 2025):
| digits | factor | from | B1 | sigma | date | who |
| 66 | 120356721451124572786431165833931833311850719344021913231764390241 | 33220+1 | 38804000 | 3:2253837059 | 05 Jan 2026 | J. Crombie |
| 65 | 10597284439301632739885491607728880288155372979749737023092294373 | 43*10254-16 | 11e7 | ??? | 13 Jan 2026 | yoyo@home/PDW |
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).
Please send an email to ``zimmerma [at] loria (dot) fr'' for any remark about this page.