Note added February 18, 2014: the latest extensions to the Cunningham tables (base 2 from 1200 to 1300, LM to 2600, on November 9, 2013, and base 5 on January 9, 2014) are not taken into account.


All remaining fields are optional. The email field is used to attribute points: please use the same as for registration.

Number factored:
Cunningham number b^n+1 or b^n-1, where b = and n =

Factoring method/program:
GMP-ECM, other ecm program, Pollard P-1
with B1 = and sigma seed = (optional)

Who found the factor:
First name: Last name:
Email address:

The ECMNET Factoring Team
$Date: 2000-03-03