Angular changes of Fourier coefficients at primes.

We study the angle changes of Fourier coefficients of cusp forms and q-exponents of generalized modular functions at primes. More precisely, we prove that both these subsequences, under certain conditions, fall infinitely often outside any given wedge W (θ 1 , θ 2) : = { r e i θ : r > 0 , θ ∈ [ θ 1 , θ 2 ] } with 0 ≤ θ 2 - θ 1 < π . [ABSTRACT FROM AUTHOR]