Task: to find two prime numbers whose product is a 400 digit number.

This 

1022731116849984128382970140461725893199
2883532546140280576806704317960648119367
2377124699979471607606314465365589539394
1805302550414778332749072722843441732197
4205545703859751798082548809071278533442
1766932914859818046781739244057376689689
2255723329228491768773454858783052995068
4787708109345332331133139141202295689475
2588959029409151843111542915460444247984
1841531569215551416798910788156968134891

[download]
is the product of a very well known 386 digit prime, 2**1279-1, and a somewhat less famous 14 digit prime, 98264582985493, one of the known 14 digit prime divisors of Googolplex + 10.

Sometimes perl is the right tool for the job... and sometimes Google is.

-sauoq
"My two cents aren't worth a dime.";

In reply to Re: Finding Primes (A Solution) by sauoq
in thread Finding Primes by Tommy

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