Let’s call PP your Potential Prime.
- (1) Choose a random number a less than PP.
- (2) Calculate a^(p-1)/2 mod PP.
- (3) If a^(PP-1)/2 /= 1 or -1 (mod PP), then PP is not prime.
- (4) If a^(PP-1)/2 = 1 or -1 (mod PP), then the probability that PP is not prime is less than 50%.
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solved Lehmann Test for prime numbers [closed]