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

Robert G. Wilson v rgwv at rgwv.com
Sat Apr 17 19:01:00 CEST 2010

```Let me guess, the final nonzero digit of n! in base 2 is ONE.

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From: "Graeme McRae" <g_m at mcraefamily.com>
Sent: Thursday, April 15, 2010 10:59 PM
To: "Sequence Fanatics Discussion list" <seqfan at list.seqfan.eu>
Subject: [seqfan] Re: Final nonzero digit of n!.

> It might be interesting to consider the last nonzero digit of n! in
> other bases. To start the ball rolling, I have developed a clever
> algorithm for finding elements of A000012, the last nonzero digit of
> n! in base 2.
>
> --Graeme McRae,
> Palmdale, CA,
> Sent from my iPhone
>
> On Apr 15, 2010, at 11:43 AM, Fritz Jacob <fritzjacob at gmail.com> wrote:
>
>> Please find the solution attached.
>>
>> best regards,
>> Fritz Jacob
>>
>>
>>
>> On Thu, Apr 15, 2010 at 9:11 PM, T. D. Noe <noe at sspectra.com> wrote:
>>
>>>> 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?
>>>
>>>
>>> It would be useful to put your method into the e-mail instead of
>>> having
>>> everyone make sense of that website.
>>>
>>> Best regards,
>>>
>>> Tony
>>>
>>>
>>
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>
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```