Journal of Numbers The latest articles from Hindawi Publishing Corporation © 2016 , Hindawi Publishing Corporation . All rights reserved. On the Rank of Elliptic Curves in Elementary Cubic Extensions Thu, 08 Oct 2015 14:06:18 +0000 We give a method for explicitly constructing an elementary cubic extension over which an elliptic curve has Mordell-Weil rank of at least a given positive integer by finding a close connection between a 3-isogeny of and a generic polynomial for cyclic cubic extensions. In our method, the extension degree often becomes small. Rintaro Kozuma Copyright © 2015 Rintaro Kozuma. All rights reserved. Hybrid Moments of the Riemann Zeta-Function Mon, 23 Feb 2015 13:45:28 +0000 The “hybrid” moments of the Riemann zeta-function on the critical line are studied. The expected upper bound for the above expression is . This is shown to be true for certain specific values of , and the explicitly determined range of . The application to a mean square bound for the Mellin transform function of is given. Aleksandar Ivić Copyright © 2015 Aleksandar Ivić. All rights reserved. New General Theorems and Explicit Values of the Level 13 Analogue of Rogers-Ramanujan Continued Fraction Thu, 27 Nov 2014 00:10:00 +0000 We prove general theorems for the explicit evaluations of the level 13 analogue of Rogers-Ramanujan continued fraction and find some new explicit values. This work is a sequel to some recent works of S. Cooper and D. Ye. Nipen Saikia Copyright © 2014 Nipen Saikia. All rights reserved. Using Continued Fractions to Compute Iwasawa Lambda Invariants of Imaginary Quadratic Number Fields Mon, 17 Nov 2014 06:45:03 +0000 Let be a prime such that and has class number 1. Then Hirzebruch and Zagier noticed that the class number of can be expressed as where the are partial quotients in the “minus” continued fraction expansion . For an odd prime , we prove an analogous formula using these which computes the sum of Iwasawa lambda invariants of and . In the case that is inert in , the formula pleasantly simplifies under some additional technical assumptions. Jordan Schettler Copyright © 2014 Jordan Schettler. All rights reserved. Representing and Counting the Subgroups of the Group Thu, 16 Oct 2014 06:47:23 +0000 We deduce a simple representation and the invariant factor decompositions of the subgroups of the group , where and are arbitrary positive integers. We obtain formulas for the total number of subgroups and the number of subgroups of a given order. Mario Hampejs, Nicki Holighaus, László Tóth, and Christoph Wiesmeyr Copyright © 2014 Mario Hampejs et al. All rights reserved. On Second Order Gap Balancing Numbers Wed, 08 Oct 2014 10:05:01 +0000 We consider the Diophantine equation for some natural numbers x, k, and r, and we call as kth order 2-gap balancing number. It was also proved that there are infinitely many first order 2-gap balancing numbers. In this paper, we show that the only second order 2-gap balancing number is 1. S. S. Rout Copyright © 2014 S. S. Rout. All rights reserved. A Mean Value Formula for Elliptic Curves Mon, 25 Aug 2014 06:22:09 +0000 It is proved in this paper that, for any point on an elliptic curve, the mean value of -coordinates of its -division points is the same as its -coordinate and that of -coordinates of its -division points is times that of its -coordinate. Rongquan Feng and Hongfeng Wu Copyright © 2014 Rongquan Feng and Hongfeng Wu. All rights reserved. On the Equation Wed, 16 Jul 2014 08:01:19 +0000 We consider certain quartic twists of an elliptic curve. We establish the rank of these curves under the Birch and Swinnerton-Dyer conjecture and obtain bounds on the size of Shafarevich-Tate group of these curves. We also establish a reduction between the problem of factoring integers of a certain form and the problem of computing rational points on these twists. Iftikhar A. Burhanuddin and Ming-Deh A. Huang Copyright © 2014 Iftikhar A. Burhanuddin and Ming-Deh A. Huang. All rights reserved. Algebraic Numbers Satisfying Polynomials with Positive Rational Coefficients Wed, 16 Jul 2014 07:55:12 +0000 A theorem of Dubickas, affirming a conjecture of Kuba, states that a nonzero algebraic number is a root of a polynomial with positive rational coefficients if and only if none of its conjugates is a positive real number. A certain quantitative version of this result, yielding a growth factor for the coefficients of similar to the condition of the classical Eneström-Kakeya theorem of such polynomial, is derived. The bound for the growth factor so obtained is shown to be sharp for some particular classes of algebraic numbers. Vichian Laohakosol and Suton Tadee Copyright © 2014 Vichian Laohakosol and Suton Tadee. All rights reserved. Generations of Correlation Averages Wed, 18 Jun 2014 06:02:20 +0000 We give a general link between weighted Selberg integrals of any arithmetic function and averages of correlations in short intervals, proved by the elementary dispersion method (our version of Linnik’s method). We formulate conjectural bounds for the so-called modified Selberg integral of the divisor functions , gauged by the Cesaro weight in the short interval and improved by these some recent results by Ivić. The same link provides, also, an unconditional improvement. Then, some remarkable conditional implications on the 2th moments of Riemann zeta function on the critical line are derived. We also give general requirements on that allow our treatment for weighted Selberg integrals. Giovanni Coppola and Maurizio Laporta Copyright © 2014 Giovanni Coppola and Maurizio Laporta. All rights reserved. Complex Roots of Unity and Normal Numbers Thu, 12 Jun 2014 10:55:29 +0000 Given an arbitrary prime number , set . We use a clever selection of the values of , in order to create normal numbers. We also use a famous result of André Weil concerning Dirichlet characters to construct a family of normal numbers. Jean Marie De Koninck and Imre Kátai Copyright © 2014 Jean Marie De Koninck and Imre Kátai. All rights reserved. Continued Fractions of Order Six and New Eisenstein Series Identities Tue, 27 May 2014 06:29:32 +0000 We prove two identities for Ramanujan’s cubic continued fraction and a continued fraction of Ramanujan, which are analogues of Ramanujan’s identities for the Rogers-Ramanujan continued fraction. We further derive Eisenstein series identities associated with Ramanujan’s cubic continued fraction and Ramanujan’s continued fraction of order six. Chandrashekar Adiga, A. Vanitha, and M. S. Surekha Copyright © 2014 Chandrashekar Adiga et al. All rights reserved. On a Rankin-Selberg -Function over Different Fields Sun, 27 Apr 2014 11:42:06 +0000 Given two unitary automorphic cuspidal representations and defined on and , respectively, with and being Galois extensions of , we consider two generalized Rankin-Selberg -functions obtained by forcefully factoring   and  . We prove the absolute convergence of these -functions for . The main difficulty in our case is that the two extension fields may be completely unrelated, so we are forced to work either “downstairs” in some intermediate extension between and , or “upstairs” in some extension field containing the composite extension . We close by investigating some special cases when analytic continuation is possible and show that when the degrees of the extension fields and are relatively prime, the two different definitions give the same generating function. Tim Gillespie Copyright © 2014 Tim Gillespie. All rights reserved. On the Distribution of -Tuples of -Free Numbers Sun, 13 Apr 2014 00:00:00 +0000 For k, being a fixed integer ≥2, a positive integer n is called k-free number if n is not divisible by the kth power of any integer >1. In this paper, we studied the distribution of r-tuples of k-free numbers and derived an asymptotic formula. Ting Zhang and Huaning Liu Copyright © 2014 Ting Zhang and Huaning Liu. All rights reserved. Sums of Products Involving Power Sums of Integers Thu, 27 Feb 2014 16:34:23 +0000 A sequence of rational numbers as a generalization of the sequence of Bernoulli numbers is introduced. Sums of products involving the terms of this generalized sequence are then obtained using an application of Faà di Bruno's formula. These sums of products are analogous to the higher order Bernoulli numbers and are used to develop the closed form expressions for the sums of products involving the power sums which are defined via the Möbius function μ and the usual power sum of a real or complex variable . The power sum is expressible in terms of the well-known Bernoulli polynomials by . Jitender Singh Copyright © 2014 Jitender Singh. All rights reserved.