Abstract
It has been shown that any prime number $p>5$ divides the repunit number $R_{p-1}$. The question of whether there are composite numbers $n$ such that $n \vert R_{n-1}$ has been answered ($n=91$ is the first such number). We investigate the distribution of these composite numbers, called deceptive primes, for $n \le 2 \cdot 10^7$, and the conjectures and questions that arise from our search.
Citation
Richard Francis. Timothy Ray. "The Deceptive Primes to $2 \cdot 10^7$." Missouri J. Math. Sci. 12 (3) 145 - 158, Fall 2000. https://doi.org/10.35834/2000/1203145
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