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Mathematics > Number Theory

Title:Farkas' identities with quartic characters

Abstract: Farkas in \cite{Farkas} introduced an arithmetic function $\delta$ and found an identity involving $\delta$ and a sum of divisor function $\sigma'$. The first-named author and Raji in \cite{Guerzhoy} discussed a natural generalization of the identity by introducing a quadratic character $\chi$ modulo a prime $p \equiv 3 \pmod 4$. In particular, it turns out that, besides the original case $p=3$ considered by Farkas, an exact analog (in a certain precise sense) of Farkas' identity happens only for $p=7$. Recently, for quadratic characters of small composite moduli, Williams in \cite{Williams} found a finite list of identities of similar flavor using different methods.
Clearly, if $p \not \equiv 3 \pmod 4$, the character $\chi$ is either not quadratic or even. In this paper, we prove that, under certain conditions, no analogs of Farkas' identity exist for even characters. Assuming $\chi$ to be odd quartic, we produce something surprisingly similar to the results from \cite{Guerzhoy}: exact analogs of Farkas' identity happen exactly for $p=5$ and $13$.
Comments: The paper is submitted
Subjects: Number Theory (math.NT)
Cite as: arXiv:1905.06506 [math.NT]
  (or arXiv:1905.06506v1 [math.NT] for this version)

Submission history

From: Ka Lun Wong [view email]
[v1] Thu, 16 May 2019 02:37:24 UTC (15 KB)