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Old 2008-10-03, 18:41   #1
Vandor
 
Oct 2008

3 Posts
Default Check the prime

Hi!
Who knows! If I have a long prime number (for example 4 million charakter - how can I check that it is a prime or not.
Thanks a lot,

Tibor

csepregitibor@yahoo.co.uk
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Old 2008-10-03, 19:20   #2
akruppa
 
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"Nancy"
Aug 2002
Alexandria

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Hi,

a good starting point for answering this question is http://primes.utm.edu/prove/index.html

Alex
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Old 2008-11-27, 14:45   #3
Vandor
 
Oct 2008

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Dear Alex,

Thanks for your response.

Currently, I am working with 20 million long prime numbers.
Could you specify little bit more your previous answer -
1./ do you know a specific program that checks on prime numbers.
2. How can I use that program exactly for checking my prime number.

Best regards,

Tibor
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Old 2008-11-27, 15:25   #4
rogue
 
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"Mark"
Apr 2003
Between here and the

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Quote:
Originally Posted by Vandor View Post
Dear Alex,

Thanks for your response.

Currently, I am working with 20 million long prime numbers.
Could you specify little bit more your previous answer -
1./ do you know a specific program that checks on prime numbers.
2. How can I use that program exactly for checking my prime number.

Best regards,

Tibor
Try PFGW, if it cannot be used to prove the primality of your number, then you are probably out of luck.
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