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Cute number theory problem
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Larry Hammick  
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 More options Oct 28 2009, 12:30 am
Newsgroups: sci.math.research
From: Larry Hammick <larryhamm...@telus.net>
Date: Tue, 27 Oct 2009 23:30:02 +0000 (GMT)
Local: Wed, Oct 28 2009 12:30 am
Subject: Cute number theory problem
Maybe I should have sent this one to the Monthly.

Let p and q be positive relatively prime odd integers. Show that the
triangle

( 0 , q/2 ) ( p/2, q/2 ) ( p/2, 0 )

has an even number of lattice points inside it.

LH


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Gordon Stangler  
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 More options Oct 28 2009, 1:30 pm
Newsgroups: sci.math.research
From: Gordon Stangler <gordon.stang...@gmail.com>
Date: Wed, 28 Oct 2009 12:30:02 +0000 (GMT)
Local: Wed, Oct 28 2009 1:30 pm
Subject: Re: Cute number theory problem
On Oct 27, 6:30 pm, Larry Hammick <larryhamm...@telus.net> wrote:

> Maybe I should have sent this one to the Monthly.

> Let p and q be positive relatively prime odd integers. Show that the
> triangle

> ( 0 , q/2 ) ( p/2, q/2 ) ( p/2, 0 )

> has an even number of lattice points inside it.

> LH

Sorry Larry, I saw this problem four years ago, at least.  I don't
remember the solution, but it was solved, as well.

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Larry Hammick  
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 More options Oct 29 2009, 7:30 am
Newsgroups: sci.math.research
From: Larry Hammick <larryhamm...@telus.net>
Date: Thu, 29 Oct 2009 06:30:01 +0000 (GMT)
Local: Thurs, Oct 29 2009 7:30 am
Subject: Re: Cute number theory problem

"Gordon Stangler" <gordon.stang...@gmail.com> wrote in message

news:hc9dga$rrv$1@crackerjack.ma.ic.ac.uk...
> On Oct 27, 6:30 pm, Larry Hammick <larryhamm...@telus.net> wrote:
>> Maybe I should have sent this one to the Monthly.

>> Let p and q be positive relatively prime odd integers. Show that the
>> triangle

>> ( 0 , q/2 ) ( p/2, q/2 ) ( p/2, 0 )

>> has an even number of lattice points inside it.

>> LH

> Sorry Larry, I saw this problem four years ago, at least.  I don't
> remember the solution, but it was solved, as well.

Damn. :D Anyhow, here's a solution this gem:

http://www.mathlinks.ro/Forum/viewtopic.php?t=148026


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