{"title":"A remark on flat ternary cyclotomic polynomials","authors":"Bin Zhang","doi":"10.3336/gm.56.2.03","DOIUrl":null,"url":null,"abstract":"Let \\(\\Phi_n(x)\\) be the \\(n\\)-th cyclotomic polynomial. In this paper, for odd primes \\(p\\lt q \\lt r\\) with \\(q\\equiv \\pm1\\pmod p\\) and \\(8r\\equiv \\pm1\\pmod {pq}\\), we prove that the coefficients of \\(\\Phi_{pqr}(x)\\) do not exceed \\(1\\) in modulus if and only if (i) \\(p=3\\), \\(q\\geq 19\\) and \\(q\\equiv 1\\pmod 3\\) or (ii) \\(p=7\\), \\(q\\geq83\\) and \\(q\\equiv -1\\pmod 7\\).","PeriodicalId":0,"journal":{"name":"","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"","FirstCategoryId":"100","ListUrlMain":"https://doi.org/10.3336/gm.56.2.03","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
Let \(\Phi_n(x)\) be the \(n\)-th cyclotomic polynomial. In this paper, for odd primes \(p\lt q \lt r\) with \(q\equiv \pm1\pmod p\) and \(8r\equiv \pm1\pmod {pq}\), we prove that the coefficients of \(\Phi_{pqr}(x)\) do not exceed \(1\) in modulus if and only if (i) \(p=3\), \(q\geq 19\) and \(q\equiv 1\pmod 3\) or (ii) \(p=7\), \(q\geq83\) and \(q\equiv -1\pmod 7\).