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From: Alan Smaill <sma...@SPAMinf.ed.ac.uk>
Newsgroups: sci.math,misc.writing,sci.logic,comp.ai.philosophy
Subject: Re: prove no largest prime
Date: Wed, 11 Jul 2012 13:12:11 +0100
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Graham Cooper <grahamcoop...@gmail.com> writes:

> On Jul 11, 9:16 pm, Frederick Williams <freddywilli...@btinternet.com>
> wrote:
>> Graham Cooper wrote:
>>
>> > On Jul 9, 11:44 pm, Frederick Williams <freddywilli...@btinternet.com>
>> > wrote:
>>
>> > > It is not the case for all n, that if you multiply the first n primes
>> > > together and add one, that the result is a prime.
>>
>> > It's NOT?
>>
>> > What's a prime factor of p1*p2*p3*p4..pn +1?
>>
>> That is unanswerable unless we know what n is.
>
>
> you've lost me.
>
> p1 is 2
> p2 is 3
> ..
>
> p1*p2*p3*p4*..*pn  has EVERY prime factor.  sequence thereof.
>
> so adding 1 it will always have a remainder.

let's see:

  2.3.5.7.11.13.17.19.23.29 + 1 = 6469693231 = 331.19545901

> Herc
>

-- 
Alan Smaill