EntityQ550402· pop 23· linked from 72 articlesDirichlet's theorem on arithmetic progressionsSign in to savetheorem that, for coprime 𝑎 and 𝑑, there are infinitely many primes congruent to 𝑎 modulo 𝑑ConnectionsDirichlet L-functionEntityChebotarev's density theoremEntityCarl Friedrich GaussEntityInternational Standard Book NumberEntityprime numberEntityintegerEntitynumber theoryEntitydigital object identifierEntityarithmetic progressionEntityJohann Peter Gustav Lejeune DirichletEntityJSTOROrganizationmultiplicative inverseEntityAdrien-Marie LegendreEntityRiemann zeta functionEntitycoprimeEntitymodular arithmeticEntityprime number theoremEntityAtle SelbergEntityEuler's totient functionEntityanalytic number theoryEntityCategoriesTheorems about prime numbersZeta and L-functions