Prove that there are infinitely many positive integers n such n(n+1) can b expressed as a sum of two positive squares in at least two different ways.(a^2 + b^2 and b^2 + a^2 are considered as the same representation.....

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- Sep 16th 2007, 10:50 AMblah_blaholymiad question....
Prove that there are infinitely many positive integers n such n(n+1) can b expressed as a sum of two positive squares in at least two different ways.(a^2 + b^2 and b^2 + a^2 are considered as the same representation.....

- Sep 16th 2007, 11:16 AMThePerfectHacker
- Sep 18th 2007, 08:41 AMblah_blah
dint really understand.....can u simplify n explain it??

- Sep 20th 2007, 08:38 PMThePerfectHacker
If you find such an so that it is a square

**and**is a square. Then and are integers.

This means,

And,

.

So the question is. "Are there infinite many such having this property?". The answer is yes. This is a consequence of the Pellian equation is you really want to show it. - Sep 22nd 2007, 08:18 AMblah_blah
thanks...i understood d whole thing except 4 d pell equation...i tried goin thru wolfram math world's explanation 4 it but i din understand it....can u help??