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Old 2019-02-12, 21:45   #6
Uncwilly
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Quote:
Originally Posted by mersenne1588 View Post
And I suppose, this approach is not only valid for the double check of a smaller number but later also for the verification of bigger numbers, right? And in my case, the numbers are probably checked using the Lucas-Lehmer primality test, correct?
Double checks and first time LL tests are the same. The test is the same. There is a different shift-count (but that is something that is invisible to the user.) Still the only time you need to pass data to and from the PrimeNet server is to get an assignment and to return a result. Many users have and some still do transfer this data to and from machines that are not connected directly to internet via a 'sneakernet'.

Traditionally numbers have been tested using the LL test, because it can give an absolute answer if a number is prime. Recently the PRP test has started to be used to show that numbers are not prime. Numbers that have had a PRP first time test should have a PRP double check. The server handles that.
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