Large Factors Found By ECM in 1997
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This file (champs97.txt) contains information on factors of at least
40 decimal digits found by the elliptic curve factoring method (ECM)
during 1997. Compiled by R. P. Brent with assistance from S. Cavallar,
B. Dodson, P. Leyland, P. Montgomery, M. Wiener and P. Zimmermann.
In 1997 there were 29 factors, summarized in the following table.
p40 p41 p42 p43 p44 p45 p46 p47 p48 total
Brent 3 1 - - - 1 - - 1 6
Cavallar 1 - - - - - - - - 1
Dodson 1 - - - - - - - - 1
Leyland - 1 - - - - - - - 1
Montgomery 4 1 2 3 - - - - - 10
Wiener - - - 1 - - - - - 1
Zimmermann 1 4 2 2 - - - - - 9
Totals 10 7 4 6 - 1 - - 1 29
In addition, someone using the pseudonym "Marin Mersenne" reported
several new factorizations without indicating the method used.
Some or all of these factorizations could have been obtained by
ECM/SNFS/MPQS or some other method. If they were all obtained by ECM
we would have an additional row in the table:
p40 p41 p42 p43 p44 p45 p46 p47 p48 p49 p50 total
Mersenne 1 2 1 2 - 1 - 1 - - 1 9
For more details see champ1.txt, champs2.txt and champsm.txt