Comment #8 on issue 2964 by smi...@gmail.com: S.One.is_prime gives True
http://code.google.com/p/sympy/issues/detail?id=2964
If we are going to use isprime then we should put a test that n is less
than 10**16 so the answer is always True. From the docstring:
"Test if n is a prime number (True) or not (False). For n < 10**16 the
answer is accurate; greater n values have a small probability of actually
being pseudoprimes."
We must "refuse the temptation to guess (or hope)" that the answer will be
correct.
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