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Old 2018-02-21, 15:02   #5
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Uncwilly's Avatar
Aug 2003
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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.
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