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20180221, 07:25  #1 
Feb 2018
3^{2} Posts 
Test a Specific Exponent in Prime95. When it is 100% done, does it mean I find a new prime number?
Test a Specific Exponent in Prime95. When it is 100% done, does it mean I find a new prime number?
I guess it will beep a message this is a prime number?????? Thanks in advance! Last fiddled with by king on 20180221 at 07:25 
20180221, 07:28  #2 
Undefined
"The unspeakable one"
Jun 2006
My evil lair
13270_{8} Posts 
Maybe. But most probably not. 100% simply means the end of the test. You won't know if it is prime or composite until the test has finished. The chance of it being prime is not very high.

20180221, 07:30  #3 
Feb 2018
3^{2} Posts 
i am just asking it will automatically tells it is a prime or not after 100%
i am simply asking it will automatically tells it is a prime or not after 100%?
and i said 100%. Last fiddled with by king on 20180221 at 07:34 
20180221, 07:40  #4 
Undefined
"The unspeakable one"
Jun 2006
My evil lair
2^{3}×727 Posts 

20180221, 15:02  #5 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
21040_{8} Posts 
The simple answer is no.
The test that Prime95 is doing has to run all the way to the end before any answer is revealed. The answer can be Prime or Not Prime at the end. It has to get to 100% either way. Unlike simple tests like trying to find a factor, the LucasLehmer test only gives a result at the end of all the work. If the residue is all zero, it is prime. The residue will only become zero at the end of the last step. There is no practical way to look at the residue before that and get the answer. 
20180221, 18:15  #6 
"Curtis"
Feb 2005
Riverside, CA
1129_{16} Posts 
I don't think OP ever asked if the answer would be known before 100%. For OP's question, "will reaching 100% give me the answer of Prime! or notprime", the answer is yes.

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