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arxiv 2211.05010 v1 pith:UYACB5RI submitted 2022-11-09 math.NT

On a conjecture of Franuv si\'c and Jadrijevi\' c: Counter-examples

classification math.NT
keywords sqrtconjecturefranujadrijevimathbbconsequencecountercounter-examples
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Let $d\equiv 2\pmod 4$ be a square-free integer such that $x^2 - dy^2 =- 1$ and $x^2 - dy^2 = 6$ are solvable in integers. We prove the existence of infinitely many quadruples in $\mathbb{Z}[\sqrt{d}]$ with the property $D(n)$ when $n \in \{(4m + 1) + 4k\sqrt{d}, (4m + 1) + (4k + 2)\sqrt{d}, (4m + 3) + 4k\sqrt{d}, (4m + 3) + (4k + 2)\sqrt{d}, (4m + 2) + (4k + 2)\sqrt{d}\}$ for $m, k \in \mathbb{Z}$. As a consequence, we provide few counter examples to a conjecture of Franu\v si\'c and Jadrijevi\' c (see Conjecture 1.1).

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