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On Ramanujan congruences for modular forms of integral and half-integral weights
Authors:B. Datskovsky   P. Guerzhoy
Affiliation:Department of Mathematics, Temple University, Philadelphia, Pennsylvania 19122 ; Department of Mathematics, Technion-Israel Institute of Technology, 32000 Haifa, Israel
Abstract:In 1916 Ramanujan observed a remarkable congruence: $tau (n)equiv sigma _{11}(n) quad bmod , 691$. The modern point of view is to interpret the Ramanujan congruence as a congruence between the Fourier coefficients of the unique normalized cusp form of weight $12$ and the Eisenstein series of the same weight modulo the numerator of the Bernoulli number $B_{12}$. In this paper we give a simple proof of the Ramanujan congruence and its generalizations to forms of higher integral and half-integral weights.

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