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Natural divisors and the brownian motion

Eugenijus Manstavičius (1996)

Journal de théorie des nombres de Bordeaux

A model of the Brownian motion defined in terms of the natural divisors is proposed and weak convergence of the related measures in the space 𝐃 [0,1] is proved. An analogon of the Erdös arcsine law, known for the prime divisors [6] (see [14] for the proof), is obtained. These results together with the author’s investigation [15] extend the systematic study [9] of the distribution of natural divisors. Our approach is based upon the functional limit theorems of probability theory.

(Non)Automaticity of number theoretic functions

Michael Coons (2010)

Journal de Théorie des Nombres de Bordeaux

Denote by λ ( n ) Liouville’s function concerning the parity of the number of prime divisors of n . Using a theorem of Allouche, Mendès France, and Peyrière and many classical results from the theory of the distribution of prime numbers, we prove that λ ( n ) is not k –automatic for any k > 2 . This yields that n = 1 λ ( n ) X n 𝔽 p [ [ X ] ] is transcendental over 𝔽 p ( X ) for any prime p > 2 . Similar results are proven (or reproven) for many common number–theoretic functions, including ϕ , μ , Ω , ω , ρ , and others.

Normal numbers and the middle prime factor of an integer

Jean-Marie De Koninck, Imre Kátai (2014)

Colloquium Mathematicae

Let pₘ(n) stand for the middle prime factor of the integer n ≥ 2. We first establish that the size of log pₘ(n) is close to √(log n) for almost all n. We then show how one can use the successive values of pₘ(n) to generate a normal number in any given base D ≥ 2. Finally, we study the behavior of exponential sums involving the middle prime factor function.

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