539 research outputs found

    Hidden structure in the randomness of the prime number sequence?

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    We report a rigorous theory to show the origin of the unexpected periodic behavior seen in the consecutive differences between prime numbers. We also check numerically our findings to ensure that they hold for finite sequences of primes, that would eventually appear in applications. Finally, our theory allows us to link with three different but important topics: the Hardy-Littlewood conjecture, the statistical mechanics of spin systems, and the celebrated Sierpinski fractal.Comment: 13 pages, 5 figures. New section establishing connection with the Hardy-Littlewood theory. Published in the journal where the solved problem was first describe

    On the Diophantine properties of lambda-expansions

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    For λ(1/2,1)\lambda \in (1/2, 1) and α\alpha, we consider sets of numbers xx such that for infinitely many nn, xx is 2αn2^{-\alpha n}-close to some i=1nωiλi\sum_{i=1}^n \omega_i \lambda^i, where ωi{0,1}\omega_i \in \{0,1\}. These sets are in Falconer's intersection classes for Hausdorff dimension ss for some ss such that 1αlogλlog2s1α- \frac{1}{\alpha} \frac{\log \lambda}{\log 2} \leq s \leq \frac{1}{\alpha}. We show that for almost all λ(1/2,2/3)\lambda \in (1/2, 2/3), the upper bound of ss is optimal, but for a countable infinity of values of λ\lambda the lower bound is the best possible result.Comment: 21 page
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