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

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Helmut Richter

Posts: 164
Registered: 7/4/06
Re: Pell type equations
Posted: Apr 29, 2012 7:13 AM
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On Sun, 29 Apr 2012, Terry M wrote:

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

This is 100% correct.

I mentioned only the 6 as example but the others are correct as well.
The 1 and 5 could have been caught modulo 4, but for the 6 it is necessary
to check modulo 8.

Helmut Richter

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