'Dr.' Elphinstone
 

After being inspired by the mathematical research performed by 'Dr.' Elphinstone... ;) (http://www.mersenneforum.org/viewtopic.php?t=832) I'd thought I'd post the following puzzle...

Find a small factor (or any factor) of the Mersenne number 2^(157,456,128,945,769)-1.

btw - I haven't actually found a factor for this number... and it would take longer than the age of the universe to test this number for primality on a P4, so if you can't find a small factor, you should probably just give up.

But don't worry, it's only 47,399,017,813,816 digits long!

Bragoria

This is off topic.

"Puzzles" are restricted to problems for which the poster can, and will, post a solution after a few days.