E54 -- Theorematum quorundam ad numeros primos spectantium demonstratio

(A proof of certain theorems regarding prime numbers)


Summary:
(based on the abstract of David Zhao's English translation)
This paper presents the first proof of the Euler-Fermat theorem, also known as Fermat's Little Theorem, that ap-1 ≡ 1 mod p for all a relatively prime to p. Euler begins by showing that 2p-1 ≡ 1 mod p for p ≠ 2, after which he shows that 3p-1 ≡ 1 mod p for p ≠ 3. He then concludes that the formua holds for all a relatively prime to p.

According to the records, it was presented to the St. Petersburg Academy on August 2, 1736.

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