Euler's totient theorem

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In number theory, Euler's totient theorem (also known as the Fermat–Euler theorem) states that if n and a are coprime, (meaning that the only number that divides n and a is 1), then the following equivalence relation holds:[1]

where is Euler's totient function.

Euler's theorem is a more refined theorem of Fermat's little theorem, which Pierre de Fermat had published in 1640, a hundred years prior. Fermat's theorem remained unproven until the work of 18th-century Swiss mathematician Leonhard Euler.[2]

References[change | change source]

  1. "Euler's Totient Function and Euler's Theorem". Retrieved 2021-04-12.
  2. "Art of Problem Solving". Retrieved 2021-04-12.