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Mathematics of Computation

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On a problem of A. Rotkiewicz

Authors: Péter Kiss and Bui Minh Phong
Journal: Math. Comp. 48 (1987), 751-755
MSC: Primary 11A51; Secondary 11A05
MathSciNet review: 878704
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Abstract: For any fixed positive integers a, $k \geqslant 2$ there are infinitely many composite integers n such that ${a^{n - k}} \equiv 1\;(\bmod n)$.

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Keywords: Congruence, primitive prime divisor
Article copyright: © Copyright 1987 American Mathematical Society