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Andrews introduced the partition function $\overline{C}_{k, i}(n)$, called singular overpartition, which counts the number of overpartitions of $n$ in which no part is divisible by $k$ and only parts $\equiv \pm i\pmod{k}$ may be overlined.…

Number Theory · Mathematics 2019-06-13 Rupam Barman , Chiranjit Ray

Andrews' $(k, i)$-singular overpartition function $\overline{C}_{k, i}(n)$ counts the number of overpartitions of $n$ in which no part is divisible by $k$ and only parts $\equiv \pm i\pmod{k}$ may be overlined. In recent times, divisibility…

Number Theory · Mathematics 2021-07-13 Ajit Singh , Rupam Barman

The $(k,i)$-singular overpartitions, combinatorial objects introduced by Andrews in 2015, are known to satisfy Ramanujan-type congruences modulo any power of prime coprime to $6k$. In this paper we consider the parity of the number…

Number Theory · Mathematics 2023-12-05 Victor Manuel Aricheta , Jerome Dimabayao , Hazel Joy Shi

In this article, we first investigate the partitions whose parts are congruent to $a$ or $b$ modulo $k$ with the aid of separable integer partition classes with modulus $k$ introduced by Andrews. Then, we introduce the…

Combinatorics · Mathematics 2024-07-01 Thomas Y. He , C. S. Huang , H. X. Li , X. Zhang

Singular overpartitions, which are defined by George Andrews, are overpartitions whose Frobenius symbols have at most one overlined entry in each row. In his paper, Andrews obtained interesting combinatorial results on singular…

Combinatorics · Mathematics 2017-05-19 Seunghyun Seo , Ae Ja Yee

Recently, Andrews defined a partition function $\mathcal{EO}(n)$ which counts the number of partitions of $n$ in which every even part is less than each odd part. He also defined a partition function $\overline{\mathcal{EO}}(n)$ which…

Number Theory · Mathematics 2020-02-19 Chiranjit Ray , Rupam Barman

Recently, Andrews considered the partitions with parts separated by parity, in which parts of a given parity are all smaller than those of the other parity. Inspired from the partitions with parts separated by parity, we investigate the…

Combinatorics · Mathematics 2025-06-03 Y. H. Chen , Thomas Y. He , Y. Hu , Y. X. Xie

For $k\geq i\geq 1$, let $B_{k,i}(n)$ denote the number of partitions of $n$ such that part 1 appears at most $i-1$ times, two consecutive integers l and $l+1$ appear at most $k-1$ times and if l and $l+1$ appear exactly $k-1$ times then…

Combinatorics · Mathematics 2012-03-21 William Y. C. Chen , Doris D. M. Sang , Diane Y. H. Shi

Recently, Andrews introduced separable integer partition classes and analyzed some well-known theorems. In this paper, we investigate partitions with parts separated by parity introduced by Andrews with the aid of separable integer…

Combinatorics · Mathematics 2023-10-30 Y. H. Chen , Thomas Y. He , F. Tang , J. J. Wei

Alanzi et al. (2022) investigated overpartition of a positive integer $n$ with $\ell$-regular non-overlined parts denoted by $\overline R_\ell^\ast (n)$, and proved some results for the case $\ell=3$. As extension to the results of Alanzi…

Number Theory · Mathematics 2025-03-26 Nipen Saikia , Adam Paksok

In this paper, we study the partition functions $\overline{R_\ell^\ast}(n)$, which count the number of overpartitions of $n$ where the non-overlined parts are $\ell$-regular for a given $\ell$. Using elementary techniques, as well as the…

Number Theory · Mathematics 2025-06-10 Hemjyoti Nath , Manjil P. Saikia , James A. Sellers

In this paper, we generalize Andrews' partitions separated by parity to overpartitions in two ways. We investigate the generating functions for 16 overpartition families whose parts are separated by parity, and we prove various $q$-series…

Number Theory · Mathematics 2026-01-14 Kathrin Bringmann , Catherine Cossaboom , William Craig

In a very recent work, G. E. Andrews defined the combinatorial objects which he called {\it singular overpartitions} with the goal of presenting a general theorem for overpartitions which is analogous to theorems of Rogers--Ramanujan type…

Number Theory · Mathematics 2024-05-31 Shi-Chao Chen , Michael D. Hirschhorn , James A. Sellers

Bessenrodt and Ono, Chen, Wang and Jia, DeSalvo and Pak were the first to discover the log-subadditivity, log-concavity, and the third-order Tur\'{a}n inequality of partition function, respectively. Many other important partition statistics…

Number Theory · Mathematics 2023-08-10 Yi Peng , Helen W. J. Zhang , Ying Zhong

Inspired by Andrews' and Bachraoui's work on partitions with repeated smallest part, we extend the concept to overpartitions. We study overpartitions with the restriction that the smallest non-overlined part appears exactly $k$ times and…

Combinatorics · Mathematics 2026-03-31 Amita Malik , Rishabh Sarma

Recently, Andrews and Dastidar introduced the partition function $SOME(n)$, defined as the sum of all the odd parts in the partitions of $n$ minus the sum of all the even parts in the partitions of $n$. They derived its generating function…

Combinatorics · Mathematics 2026-03-16 D. S. Gireesh , B. Hemanthkumar

In his classic text, \emph{Combinatory Analysis}, MacMahon defined a perfect partition of a positive integer $n$ as a partition whose parts contain exactly one partition of every positive integer not exceeding $n$. In this paper we apply…

Combinatorics · Mathematics 2025-10-21 Augustine O. Munagi

Recently, Shen (2016) and Alanazi et al. (2016) studied the arithmetic properties of the $\ell$-regular overpartition function $\overline{A}_\ell (n)$, which counts the number of overpartitions of $n$ into parts not divisible by $\ell$. In…

Number Theory · Mathematics 2017-06-12 Shane Chern

Recently, Andrews gave a detailed study of partitions with even parts below odd parts in which only the largest even part appears an odd number of times. In this paper, we provide a combinatorial proof of the generating function identity of…

Combinatorics · Mathematics 2017-10-25 Shane Chern

In this paper we give a full description of the inequalities that can occur between overpartition ranks. If $ \overline{N}(a,c,n) $ denotes the number of overpartitions of $ n $ with rank congruent to $ a $ modulo $ c,$ we prove that for…

Number Theory · Mathematics 2020-11-06 Alexandru Ciolan
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