Evaluation of the convolution sums σa1m1+a2m2+a3m3+a4m4=nσ (m1) σ (m2) σ (m3) σ (m4) with lcm (α1,a2,a3,a4) ≤ 4

Joohee Lee, Yoon Kyung Park

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The generating functions of divisor functions are quasimodular forms of weight 2 and the product of them is a quasimodular form of higher weight. In this work, we evaluate the convolution sumsa1m1+a2m2+a3m3+a4m4=nσ(m1)σ(m2)σ(m3)σ(m4) for the positive integers a1,a2,a3,a4, and n with lcm(a1,a2,a3,a4) ≤ 4. We reprove the known formulas for the number of representations of a positive integer n by each of the quadratic forms j=016x j2 and j=18(x 2j-12 + x 2j-1x2j + x2j2) as an application of the new identities proved in this paper.

Original languageEnglish
Pages (from-to)2155-2173
Number of pages19
JournalInternational Journal of Number Theory
Volume13
Issue number8
DOIs
StatePublished - 1 Sep 2017

Keywords

  • Convolution sum
  • quasimodular form
  • sums of divisor functions
  • the number of representation by quadratic forms

Fingerprint

Dive into the research topics of 'Evaluation of the convolution sums σa1m1+a2m2+a3m3+a4m4=nσ (m1) σ (m2) σ (m3) σ (m4) with lcm (α1,a2,a3,a4) ≤ 4'. Together they form a unique fingerprint.

Cite this