I've chosen primality test task, but info shows P1 factoring! Why ?
I've chosen primality test task, but info shows P1 factoring! Why ?

[QUOTE=Unregistered]I've chosen primality test task, but info shows P1 factoring! Why ?[/QUOTE]
Because the program tests for factors each exponent before starting a timeconsuming primality test. If you don't want it, there is a switch to avoid P1 test. Luigi 
[QUOTE=ET_]Because the program tests for factors each exponent before starting a timeconsuming primality test.
If you don't want it, there is a switch to avoid P1 test. *P: Where I can find that switch? Luigi[/QUOTE] 
Although you can skip the P1 factoring if you really want to, please consider letting it proceed.
The bounds for P1 factoring are chosen to maximize GIMPS throughput. That is, on average a GIMPS participant will "clear" (prove to be composite) more exponents in a given time if the automatic P1 step is allowed to precede the LL test. It won't change your chances of finding a Mersenne prime. If P1 finds a factor, then the LL test would have found that the Mersenne number is composite but you will have saved yourself the time needed to run that LL test and can proceed to your next number assignment sooner. Also, if you skip P1 factoring before doing the LL test, then later on someone else finds a factor by doing the P1 step you skipped, you will lose GIMPS credit (on the GIMPS Top Producers list) for your LL test, although your PrimeNet credits (on the PrimeNet Top Producers list) will remain unchanged. 
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