Why do you think that truncating Stirling's series is preferable to approximating the more accurate Lanczos asymptotic series (which is valid for Re(n) > 0)? It is more 'robust' to calculate the logarithm of the gamma function because you are less prone to overflow for large values of n.

In reply to Re: Re: Re: Factorial algorithm execution time by greenback
in thread Factorial algorithm execution time by gri6507

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