“…We note that by [4, Theorem 1] of Friedlander, we can obtain an asymptotic formula for Ψ(x; y, z) in certain regions. We also mention that Saias [15,16,17] has extensively studied this quantity. In particular, our Ψ(x k ; y, z) is θ(x k , z, y) or Θ(x k , z, y) in the notation of Friedlander and Saias respectively.…”