The extensibility of the Diophantine triple $\{2, b, c\}$

Fuente: arXiv
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Main Authors: Adžaga, Nikola, Filipin, Alan, Jurasić, Ana
Format: Preprint
Published: 2026
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_version_ 1866912853513994240
author Adžaga, Nikola
Filipin, Alan
Jurasić, Ana
author_facet Adžaga, Nikola
Filipin, Alan
Jurasić, Ana
contents The aim of this paper is to consider the extensibility of the Diophantine triple $\{2,b,c\}$, where $2<b<c$, and to prove that such a set cannot be extended to an irregular Diophantine quadruple. We succeed in that for some families of $c$'s (depending on $b$). As corollary, for example, we prove that for $b/2-1$ prime, all Diophantine quadruples $\{2,b,c,d\}$ with $2<b<c<d$ are regular.
format Preprint
id arxiv_https___arxiv_org_abs_2601_19803
institution arXiv
publishDate 2026
record_format arxiv
spellingShingle The extensibility of the Diophantine triple $\{2, b, c\}$
Adžaga, Nikola
Filipin, Alan
Jurasić, Ana
Number Theory
11D09 (Primary), 11D45, 11B37, 11J86 (Secondary)
The aim of this paper is to consider the extensibility of the Diophantine triple $\{2,b,c\}$, where $2<b<c$, and to prove that such a set cannot be extended to an irregular Diophantine quadruple. We succeed in that for some families of $c$'s (depending on $b$). As corollary, for example, we prove that for $b/2-1$ prime, all Diophantine quadruples $\{2,b,c,d\}$ with $2<b<c<d$ are regular.
title The extensibility of the Diophantine triple $\{2, b, c\}$
topic Number Theory
11D09 (Primary), 11D45, 11B37, 11J86 (Secondary)
url https://arxiv.org/abs/2601.19803