7-27-1837

Dirichlet presented his first analytic number theory paper at a meeting of the Berlin Academy of Sciences. He proved the fundamental theorem that bears his name: Every arithmetical sequence an + b, n = 0, 1, 2, ... of integers, where a and b are relatively prime, contains infinitely many primes.

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Johann Peter Lejeune Dirichlet
Dirichlet's Theorem on Arithmetic Progressions
Adrien-Marie Legendre