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On the divisor function of sets with even partition functions
Authors:N. Baccar  F. Ben Sa?d  A. Zekraoui
Affiliation:(1) Université de Monastir, Faculté des Sciences de Monastir, Département de Mathématiques, Avenue de l'environnement, 5000, Monastir, Tunisie;(2) Université de Monastir, Faculté des Sciences de Monastir, Département de Mathématiques, Avenue de l'environnement, 5000, Monastir, Tunisie;(3) Université de Monastir, Faculté des Sciences de Monastir, Département de Mathématiques, Avenue de l'environnement, 5000, Monastir, Tunisie
Abstract:Summary For PF2[z] with P(0)=1 and deg(P)≧ 1, let A =A(P) be the unique subset of N (cf. [9]) such that Σn0 p(A,n)zn P(z) mod 2, where p(A,n) is the number of partitions of n with parts in A. To determine the elements of the set A, it is important to consider the sequence σ(A,n) = Σ d|n, dA d, namely, the periodicity of the sequences (σ(A,2kn) mod 2k+1)n1 for all k ≧ 0 which was proved in [3]. In this paper, the values of such sequences will be given in terms of orbits. Moreover, a formula to σ(A,2kn) mod 2k+1 will be established, from which it will be shown that the weight σ(A1,2kzi) mod 2k+1 on the orbit ]]>z_i$ is moved on some other orbit zj when A1 is replaced by A2 with A1= A(P1) and A2= A(P2) P1 and P2 being irreducible in F2[z] of the same odd order.
Keywords:cyclotomic polynomials  partitions  order of a polynomial  orbits  symmetric functions  periodic sequences  the Graeffe transformation
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