BigInteger.isProbablePrime
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public boolean isProbablePrime( int certainty )
Description
Returns true if this BigInteger is probably prime, false if it's
definitely composite. The certainty parameter is a measure
of the uncertainty that the caller is willing to tolerate:
the method returns true if the probability that this number is
is prime exceeds 1 - 1/2**certainty. The execution time is
proportional to the value of the certainty parameter.