Major arcs and moments of arithmetical sequences

We give estimates for the first two moments of arithmetical sequences in progressions. Instead of using the standard approximation, we work with a generalization of Vaughan's major arcs approximation which is similar to that appearing in earlier work of Browning and Heath-Brown on norm forms. We apply our results to the sequence $τ_k(n)$, and obtain unconditional results in a wide range of moduli.

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