Learn Java Programming - BigInteger .isProbablePrime() Part 1 Tutorial
In this tutorial I am going to discuss the .isProbablePrime() method. It returns false if the BigInteger object value is definitely composite. It returns true if the BigInteger object value is probably prime. This method is extremely fast for determining if a number is composite - maybe they should have named this method isComposite() instead ;) So why did they name it isProbablePrime() anyway??? The reason this method is so fast is because it utilizes the Miller-Rabin primality test. The math and proofs behind the Miller-Rabin primality test is way beyond the scope of this tutorial, but I will do my best to describe the general idea of how it works.
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