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Mathematics of Computation

Published by the American Mathematical Society, the Mathematics of Computation (MCOM) is devoted to research articles of the highest quality in all areas of pure and applied mathematics.

ISSN 1088-6842 (online) ISSN 0025-5718 (print)

The 2020 MCQ for Mathematics of Computation is 1.98.

What is MCQ? The Mathematical Citation Quotient (MCQ) measures journal impact by looking at citations over a five-year period. Subscribers to MathSciNet may click through for more detailed information.


On a problem of A. Rotkiewicz
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by Péter Kiss and Bui Minh Phong PDF
Math. Comp. 48 (1987), 751-755 Request permission


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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Additional Information
  • © Copyright 1987 American Mathematical Society
  • Journal: Math. Comp. 48 (1987), 751-755
  • MSC: Primary 11A51; Secondary 11A05
  • DOI:
  • MathSciNet review: 878704