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Let be the set of all integers of the form , where is a positive integer and denotes the th Fibonacci number. Leonetti and Sanna proved that has natural density equal to zero, and asked for a more precise upper bound. We prove that \begin{equation*} #\big( \cap [1, x]\big) \ll \frac{x \log \log \log x}{\log \log x} \end{equation*} for all sufficiently large .

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