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Mathematics of Computation

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On the congruence $ 2\sp {n-k}\equiv 1\;({\rm mod}\,n)$


Author: Mok-Kong Shen
Journal: Math. Comp. 46 (1986), 715-716
MSC: Primary 11A07
MathSciNet review: 829641
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Abstract: It is shown that there are infinitely many positive integers k such that the congruence $ {2^{n - k}} \equiv 1\;\pmod n$ has infinitely many solutions n.


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DOI: https://doi.org/10.1090/S0025-5718-1986-0829641-5
Article copyright: © Copyright 1986 American Mathematical Society