[seqfan] Re: Final nonzero digit of n!.

Fritz Jacob fritzjacob at gmail.com
Thu Apr 15 16:57:03 CEST 2010

I didn't get any response till now, can I take that as
"no more methods exists other than the two I mentioned"?

The reason I asked this question was, I happen to derive a formula for this
while solving a puzzle on wilmott forum


1) Can someone please verify my proof? (I am software engineer, not very
familiar with math)
2) Is this interesting enough to try for publishing?

Thanks for your response,
Fritz Jacob

On Wed, Apr 14, 2010 at 6:38 PM, Fritz Jacob <fritzjacob at gmail.com> wrote:

> Hello All,
> 1) Greg Dresden formula, which requires a computer program.
> 2) Using Shizuo Kakutani's theorem<http://www.mathematik.uni-bielefeld.de/%7Esillke/SEQUENCES/series020>,
> but this requires a look up table of 120 digits.
> Can you please tell me other than these to approaches, is there any other
> for finding the final nonzero digit of n!? If yes, can please give me
> details?
> Is there any other formula that can be used to solve this manually?
> Reference:  http://www.research.att.com/~njas/sequences/A008904<http://www.research.att.com/%7Enjas/sequences/A008904>
> Best regards,
> Fritz Jacob
> *
> *

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