Some properties of Zumkeller numbers and k-layered numbers
| Autor: | Daniel Yaqubi, Pankaj Jyoti Mahanta, Manjil P. Saikia |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Algebra and Number Theory
Mathematics - Number Theory Mathematics::Number Theory Harmonic mean 010102 general mathematics Sigma 010103 numerical & computational mathematics 11A25 11B75 11D99 01 natural sciences Combinatorics Integer Prime factor FOS: Mathematics Number Theory (math.NT) 0101 mathematics QA Perfect number Mathematics |
| Zdroj: | Journal of Number Theory. 217:218-236 |
| ISSN: | 0022-314X |
| DOI: | 10.1016/j.jnt.2020.05.003 |
| Popis: | Generalizing the concept of a perfect number is a Zumkeller or integer perfect number that was introduced by Zumkeller in 2003. The positive integer $n$ is a Zumkeller number if its divisors can be partitioned into two sets with the same sum, which will be $\sigma(n)/2$. Generalizing even further, we call $n$ a $k$-layered number if its divisors can be partitioned into $k$ sets with equal sum. In this paper, we completely characterize Zumkeller numbers with two distinct prime factors and give some bounds for prime factorization in case of Zumkeller numbers with more than two distinct prime factors. We also characterize $k$-layered numbers with two distinct prime factors and even $k$-layered numbers with more than two distinct odd prime factors. Some other results concerning these numbers and their relationship with practical numbers and Harmonic mean numbers are also discussed. Comment: 14 pages, accepted version, to appear in the Journal of Number Theory |
| Databáze: | OpenAIRE |
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