The general case on the order of appearance of product of consecutive Fibonacci and Lucas numbers
Let $F_{n}$ and $L_n$ be the $n$th Fibonacci and Lucas number, respectively. For each positive integer $m$, the order of appearance of $m$ in the Fibonacci sequence, denoted by $z(m)$, is the smallest positive integer $k$ such that $m$ divides $F_k$. Recently, D. Marques has obtained a formula for $...
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Zusammenfassung: | Let $F_{n}$ and $L_n$ be the $n$th Fibonacci and Lucas number, respectively.
For each positive integer $m$, the order of appearance of $m$ in the Fibonacci
sequence, denoted by $z(m)$, is the smallest positive integer $k$ such that $m$
divides $F_k$. Recently, D. Marques has obtained a formula for
$z(F_{n}F_{n+1})$, $z(F_{n}F_{n+1}F_{n+2})$, and
$z(F_{n}F_{n+1}F_{n+2}F_{n+3})$. In this paper, we extend Marques' result to
the case $z(F_{n}F_{n+1}\cdots F_{n+k})$ for every $4\leq k \leq 6$. We also
give a formula for $z(L_nL_{n+1}\cdots L_{n+k})$ when $k = 5,6$ which extends
the recent result of Marques and Trojovsk\'y. Our method gives a general idea
on how to obtain the formulas for $z(F_nF_{n+1}\cdots F_{n+k})$ and
$z(L_nL_{n+1}\cdots L_{n+k})$ for every $k\geq 1$. |
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DOI: | 10.48550/arxiv.1707.09512 |