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The n -th prime asymptotically

Juan Arias de Reyna, Jérémy Toulisse (2013)

Journal de Théorie des Nombres de Bordeaux

A new derivation of the classic asymptotic expansion of the n -th prime is presented. A fast algorithm for the computation of its terms is also given, which will be an improvement of that by Salvy (1994).Realistic bounds for the error with li - 1 ( n ) , after having retained the first m terms, for 1 m 11 , are given. Finally, assuming the Riemann Hypothesis, we give estimations of the best possible r 3 such that, for n r 3 , we have p n > s 3 ( n ) where s 3 ( n ) is the sum of the first four terms of the asymptotic expansion.

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