arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.10899math.NT
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关于负指数的$k$ -广义斐波那契数

On the $k$-generalized Fibonacci numbers with negative indices

Attila Pethő

摘要:

在这些注记中,我们研究了具有正指数和负指数的广义Fibonacci数列-- $(F_n^{(k)})_{n\in \Z}$.将$T_k(x)$表示为其特征多项式。我们最有趣的发现是,如果$k$是偶数,那么$T_k(x)$的第二个实根的绝对值在根中是最小的。结合Bugeaud和Kaneko \cite{BK}的一个深入结果,我们证明了在$(F_n^{(k)})_{n\in \Z}$中,只要$k$是偶数,就只存在1/2个完全幂.另一个结果是,如果$k$和$l$表示偶数,则方程$F_m^{(k)} = \pm F_n^{(l)}$在$(n,m)\in \Z^2$中只有1000个有效可计算解。在$k=l=4$的情况下,我们建立了这个方程的所有解。

英文摘要:

In these notes we study the $k$-generalized Fibonacci sequences - $(F_n^{(k)})_{n\in \Z}$ - with positive and negative indices. Denote $T_k(x)$ its characteristic polynomial. Our most interesting finding is that if $k$ is even then the absolute value of the second real root of $T_k(x)$ is minimal among the roots. Combining this with a deep result of Bugeaud and Kaneko \cite{BK} we prove that there are only finitely many perfect powers in $(F_n^{(k)})_{n\in \Z}$, provided $k$ is even. Another consequence is that, if $k$ and $l$ denote even integers then the equation $F_m^{(k)} = \pm F_n^{(l)}$ has only finitely many effectively computable solutions in $(n,m)\in \Z^2$. In the case $k=l=4$ we establish all solutions of this equation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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