> david eddy wrote:
> > The important reason a LL-test goes wrong is due to
> > using floating point FFT to perform exact integer arithmetic.
> 

Richard Woods wrote
> No, that's not it.

.......

Yes thank you.

 It figures that if one iteration has a non-sero probability of rounding error
then 30,000,000 of them will have 100% error rate.

So the gradual increase in error rate with exponent size (which would make 
choosing ~30% 
errror rate as the optimum) does not apply. We have effectively got a step 
function.
The range for a given FFT size chooses itself.

David Eddy


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