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user 151471
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Density of integers related to the size of its order of appearance in the Fibonacci sequence
Let $z(n)=\min\{k>0 : n\mid F_k\}$. This function is known as the Fibonacci entry point (for example). A result of Sallé gives the sharpest upper bound for $z(n)$, namely, $z(n)\leq 2n$, for all $n$ ( …
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