Geodesic
The Concentration Function of Additive Functions with Nonmultiplicative Weight
Matematičeskie zametki, Tome 75 (2004) no. 6, pp. 877-894.

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Suppose that $g(n)$ is a real-valued additive function and $\tau(n)$ is the number of divisors of $n$. In this paper, we prove that there exists a constant $C$ such that $$ \sup_a\sum_{\substack n\\g(n)\in[a,a+1)} \tau(N-n) \le C\frac{N\,\log N}{\sqrt{W(N)}}, $$ where $$ W(N) =4+\min_\lambda\biggl(\lambda^2 +\sum_{p} \frac1p\min\bigl(1,(g(p)-\lambda\log p)^2\bigr)\biggr). $$ In particular, it follows from this result that $$ \sup_a\bigl|\bigl\{m,n:mn,\;g(N-mn)=a\bigr\}\bigr| \ll N\,\log N\, \biggl(\sum_{p,\,g(p)\ne0}(1/p)\biggr)^{-1/2}. $$ The implicit constant is absolute. 
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N. M. Timofeev; M. B. Khripunova. The Concentration Function of Additive Functions with Nonmultiplicative Weight. Matematičeskie zametki, Tome 75 (2004) no. 6, pp. 877-894. http://geodesic.mathdoc.fr/item/MZM_2004_75_6_a6/

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