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-   -   Test a Specific Exponent in Prime95. When it is 100% done, does it mean I find a new prime number? (https://www.mersenneforum.org/showthread.php?t=23076)

king 2018-02-21 07:25

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!

retina 2018-02-21 07:28

[QUOTE=king;480537]Test a Specific Exponent in Prime95. When it is 100% done, does it mean I find a new prime number?[/QUOTE]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.

king 2018-02-21 07:30

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 [B]100%[/B].


[QUOTE=retina;480538]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.[/QUOTE]

retina 2018-02-21 07:40

[QUOTE=king;480539]i am simply asking it will automatically tells it is a prime or not after 100%?

and i said [B]100%[/B].[/QUOTE]Okay, yes it will. You will know immediately the result.

Uncwilly 2018-02-21 15:02

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 Lucas-Lehmer 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.

VBCurtis 2018-02-21 18:15

[QUOTE=Uncwilly;480555]The simple answer is -no-.
....
There is no practical way to look at the residue before that and get the answer.[/QUOTE]

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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