Author: Sune Fischer
Date: 14:20:08 05/26/05
Go up one level in this thread
On May 26, 2005 at 16:37:48, Tord Romstad wrote:
>You are right. The largest currently known prime number has 7,816,230 digits.
>There are now five known prime numbers with more than one million digits.
Why do people keep repeating to me what I said? :)
http://primes.utm.edu/largest.html#biggest
>>Last I checked only a handful or so had been found with more than a million
>>digits, and of course only through weeks of massively parallel super computer
>>power.
>
>It's not quite that bad. The current record prime was found on a single-CPU
>P4 2.4 GHz in 50 days. See the GIMPS ("Great Internet Mersenne Prime Search")
>page for details:
I think these bots just scan a range of mersenne numbers. When they find one
they can't easily dispute as non-prime it goes through tougher tests for final
primality verification.
Finding a number that is 99.99% positively prime is "easy", proving it 100% is
though :)
-S.
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