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Old 2005-11-04, 04:17   #1
Ding_Cong
 
Oct 2004
Shanghai,China

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Question Is it possible to test an exponent > 79300000 ?

in the "prime95.chm" i read "The Test choice can be used to run a Lucas-Lehmer test on one Mersenne number. Enter the Mersenne number's exponent - this must be a prime number between 5 and 79300000."

but ,if zhe prime number over 79300000, how can i do?
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Old 2005-11-04, 08:50   #2
jinydu
 
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Dec 2003
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If I remember correctly, the newer versions of prime95 allow testing of larger exponents, but I could be wrong.

In any case, you can download the newest version at the main GIMPS website: www.mersenne.org (when it's not down)
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Old 2005-11-04, 11:50   #3
pacionet
 
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Quote:
Originally Posted by Ding_Cong
in the "prime95.chm" i read "The Test choice can be used to run a Lucas-Lehmer test on one Mersenne number. Enter the Mersenne number's exponent - this must be a prime number between 5 and 79300000."

but ,if zhe prime number over 79300000, how can i do?
Do you really want to test such an exponent ? It takes about one year ...
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Old 2005-11-04, 16:29   #4
jinydu
 
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Quote:
Originally Posted by pacionet
Do you really want to test such an exponent ? It takes about one year ...
Depends on the speed of your computer...

My guess is that there is probably at least an order of magnitude difference between the fastest computers working on GIMPS and the slowest ones.

Last fiddled with by jinydu on 2005-11-04 at 16:29
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Old 2005-11-04, 17:39   #5
garo
 
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Yeah it takes about one year to test a number in that range on the fastest computers. On slower ones it can take much longer.
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