Amazing! Wow! That's awesome! ++sauoq :-)

This thread has been very educational to say the least. It has opened up a door to a whole realm of thought that I didn't even know existed. I certainly didn't have any idea how big a 400 digit number was, and I didn't know that finding prime numbers was such an important quest.

Thanks everyone for your very helpful input.

--
Tommy Butler, a.k.a. TOMMY