From: scott@helsbreth.org (Scott Nelson)
Subject: Re: Has 2^880 + 1 been factored?
Date: Mon, 03 Jan 2000 19:54:40 GMT
Newsgroups: sci.math

On Mon, 03 Jan 2000, George Marsaglia <geo@stat.fsu.edu> wrote:

>If  the 156-digit composite divisor of 2^880+1 has been factored, I
>haven't been able to find it in  progress reports on the Cunningham
>project.  A complete
>factorization would provide the period of an exceptionally long-period
>random
>number generator, using the subtract-with-borrow method  with the prime
>2^14528-2^12768 +1.
>George Marsaglia

It was a 152-digit composite, but yes, it was factored on 
6.7.99 by Arjen Bot if I read
http://www.loria.fr/~zimmerma/records/c120-355 correctly.

http://www.loria.fr/~zimmerma/records/ecmnet.html
has the most up to date information that I know of on
the Cunningham project (and many others)

The complete factorization of 2^880+1 is;

65537
414721
5304641
32655041
44479210368001
374871146580481
36589369917525430721
212669637382198127520411474271156481
275509565477848842604777623828011666349761

4789731651268105122196599921374684195652034708243503881000
2558288440226076697587976109330557300524416001065793918081

(that last prime is 116 digits, I split it for usenet)

Hope that helps.

Scott Nelson <scott@helsbreth.org>