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Topic: Pell type equations
Replies: 29   Last Post: Apr 29, 2012 5:37 PM

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Terry M

Posts: 15
Registered: 4/26/12
Re: Pell type equations
Posted: Apr 29, 2012 6:14 AM
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"Terry M" <here@home.net> wrote in message
news:Csidnbi0pcV7jwDSnZ2dnUVZ8nqdnZ2d@bt.com...
>
> "Helmut Richter" <hhr-m@web.de> wrote in message
> news:alpine.LNX.2.00.1204281339210.6033@badwlrz-clhri01.ws.lrz.de...

>> On Sat, 28 Apr 2012, Terry M wrote:
>
>> e.g. 3x² + 7y² is never 6 (mod 8).
>
> Hi Helmut,
>
> The more I reread your posts, the more I'm getting confused :(
>
> possible values of 3x² (Mod 8) are 0, 3 and 4
> possible values of 7y² (Mod 8) are 0, 4 and 7
>
> so 3x² + 7y² can only be 0, 3, 4 or 7 (Mod 8)


correction: so 3x² + 7y² can only be 0, 2, 3, 4, 7 (Mod 3)
>
> so 3x² + 7y² is never 1, 2, 5 or 6 (Mod 8)


correction: so 3x² + 7y² is never 1, 5 or 6 (Mod 8)

>
> I think I'm correct in this ?

>> Helmut Richter
>




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