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arXiv 0907.1725math.NTmath.CO
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关于整数表示为X^2+Y^2+Z^2和3次、5次模方程

On representation of an integer as a sum by X^2+Y^2+Z^2 and the modular equations of degree 3 and 5

Alexander Berkovich

摘要:

我讨论了各种结果涉及s(n),作为三个平方和的n表示的数量。我的目标之一是揭示许多有趣的连接之间的性质,这一职能和某些模块方程的程度3和5。特别地,我证明了s(25 n)=(6-(-n| 5))s(n)-5s(n/25)可以很容易地从著名的5次Ramanujan模方程得出。此外,还建立了s(n)与h(n),g(n),$n$用三元二次型2x^2+ 2y^2+2z^2-yz+zx+xy和x^2+y^2+3z^2+xy表示的个数之间的关系.我对s(p^2n)-ps(n)提出了一个有趣的恒等式,其中p是奇素数。这个恒等式利用了判别式为p^2,16p^2的三元二次型。

英文摘要:

I discuss a variety of results involving s(n), the number of representations of n as a sum of three squares. One of my objectives is to reveal numerous interesting connections between the properties of this function and certain modular equations of degree 3 and 5. In particular, I show that s(25n)=(6-(-n|5))s(n)-5s(n/25) follows easily from the well known Ramanujan modular equation of degree 5. Moreover, I establish new relations between s(n) and h(n), g(n), the number of representations of $n$ by the ternary quadratic forms 2x^2+2y^2+2z^2-yz+zx+xy and x^2+y^2+3z^2+xy, respectively. I propose an interesting identity for s(p^2n)- p s(n) with p being an odd prime. This identity makes nontrivial use of the ternary quadratic forms with discriminants p^2, 16p^2.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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