Let f = Sigma(n>0) a(n)q(n), a(n) real, be an arbitrary nonzero cusp form of even integral weight k >= 2 on Gamma(0)(N), square free N. We obtain an effective bound that the first sign change of a(n) occurs.
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School of Mathematics, Tata Institute of Fundamental Research, Mumbai-400 005, Homi Bhabha RoadSchool of Mathematics, Tata Institute of Fundamental Research, Mumbai-400 005, Homi Bhabha Road