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A proof of the Hoggatt-Bergum conjecture
Authors:Andrej Dujella
Institution:Department of Mathematics, University of Zagreb, Bijenicka cesta 30, 10000 Zagreb, Croatia
Abstract:It is proved that if $k$ and $d$ are positive integers such that the product of any two distinct elements of the set

\begin{displaymath}\{F_{2k},\, F_{2k+2},\, F_{2k+4},\, d\} \end{displaymath}

increased by $1$ is a perfect square, then $d$ has to be $4F_{2k+1}F_{2k+2}F_{2k+3}$. This is a generalization of the theorem of Baker and Davenport for $k=1$.

Keywords:Fibonacci numbers  property of Diophantus  simultaneous Pellian equations  linear form in logarithms  Baker-Davenport reduction procedure
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