I did some computations but I am stuck in finding the exression of the sum $$\lambda_f(n^2)+\lambda_f(n)^2 $$ in terms of $\lambda_f(n),$ where $f$ is a modular form for the full modular group. Any help is appreciated.
2026-03-31 06:00:28.1774936828
Finding the value of a sum of two Hecke eigenvalues
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