Displaying 121 – 140 of 200

Showing per page

Power values of certain quadratic polynomials

Anthony Flatters (2010)

Journal de Théorie des Nombres de Bordeaux

In this article we compute the q th power values of the quadratic polynomials f [ x ] with negative squarefree discriminant such that q is coprime to the class number of the splitting field of f over . The theory of unique factorisation and that of primitive divisors of integer sequences is used to deduce a bound on the values of q which is small enough to allow the remaining cases to be easily checked. The results are used to determine all perfect power terms of certain polynomially generated integer...

Progressions arithmétiques dans les nombres premiers

Bernard Host (2004/2005)

Séminaire Bourbaki

Récemment, B. Green et T. Tao ont montré que : l’ensemble des nombres premiers contient des progressions arithmétiques de toutes longueurs répondant ainsi à une question ancienne à la formulation particulièrement simple. La démonstration n’utilise aucune des méthodes “transcendantes” ni aucun des grands théorèmes de la théorie analytique des nombres. Elle est écrite dans un esprit proche de celui de la théorie ergodique, en particulier de celui de la preuve par Furstenberg du théorème de Szemerédi,...

Remarks on Ramanujan's inequality concerning the prime counting function

Mehdi Hassani (2021)

Communications in Mathematics

In this paper we investigate Ramanujan’s inequality concerning the prime counting function, asserting that π ( x ) 2 < e x log x π x e for x sufficiently large. First, we study its sharpness by giving full asymptotic expansions of its left and right hand sides expressions. Then, we discuss the structure of Ramanujan’s inequality, by replacing the factor x log x on its right hand side by the factor x log x - h for a given h , and by replacing the numerical factor e by a given positive α . Finally, we introduce and study inequalities analogous...

Currently displaying 121 – 140 of 200