Need books/articles with proofs of polygonal number theorem

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Fermat's polygonal number theorem states that any number can be expressed as the sum of n n-gonal numbers. For a presentation, resources like Nathanson's "Additive Number Theory" and Stillwell's "Mathematics and Its History" are recommended, as they provide historical context and proofs. Cauchy originally proved the theorem in 1813, with Nathanson offering a more concise proof in 1987. The request emphasizes the need for elementary proofs due to a lack of background in number theory. Finding accessible literature on this theorem will enhance understanding and presentation quality.
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I am giving a short presentation on Fermat's polygonal number theorem (any number may be written as the sum of n n-gonal numbers). I need books that provide some exposition/history on the theorem as well as a proof. I acquired Nathanson's Additive Number Theory from my university's library, but I'm not sure where to find more on the subject.

Oh, and the proofs should preferably be elementary, as I really know no number theory at all.
 
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Wow, quite a coincidence - I just read chapter 3 of Stillwell, "Mathematics and Its History", which mentions this result! He says it was proved by Cauchy in 1813, with a "short" proof by Nathanson in 1987 (Proc Am Math Soc, 99, 22-24).

good luck!
 
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