On 11/22/06, Richard Mathar <mathar at strw.leidenuniv.nl> wrote: > http://web.archive.org/web/20040609202646/www.spacefire.com/numbertheory/ I've put an updated version of Joe's Database of 2^x-3 factorizations at http://www-cse.ucsd.edu/users/maxal/2nm3_db.txt Please contribute if you like. Max