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A search for Fibonacci-Wieferich and Wolstenholme primes
Authors:Richard J McIntosh  Eric L Roettger
Institution:Department of Mathematics and Statistics, University of Regina, Regina, Saskatchewan, Canada S4S 0A2 ; Department of Mathematics and Statistics, University of Calgary, Calgary, Alberta, Canada T2N 1N4
Abstract:A prime $ p$ is called a Fibonacci-Wieferich prime if $ F_{p-({p\over5})}\equiv 0\pmod{p^2}$, where $ F_n$ is the $ n$th Fibonacci number. We report that there exist no such primes $ p<2\times10^{14}$. A prime $ p$ is called a Wolstenholme prime if $ {2p-1\choose p-1}\equiv 1\pmod {p^4}$. To date the only known Wolstenholme primes are 16843 and 2124679. We report that there exist no new Wolstenholme primes $ p<10^9$. Wolstenholme, in 1862, proved that $ {2p-1\choose p-1}\equiv 1\pmod {p^3}$ for all primes $ p\ge 5$. It is estimated by a heuristic argument that the ``probability' that $ p$ is Fibonacci-Wieferich (independently: that $ p$ is Wolstenholme) is about $ 1/p$. We provide some statistical data relevant to occurrences of small values of the Fibonacci-Wieferich quotient $ F_{p-({p\over5})}/p$ modulo $ p$.

Keywords:Fibonacci number  Wieferich prime  Wall-Sun-Sun prime  Wolstenholme prime  
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