On equations σ(n)=σ(n+k) and φ(n)=φ(n+k)
classification
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sigmavarphiequationssolutionsboundsdistributiongiveupper
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We study the distribution of solutions of equations $\sigma(n)=\sigma(n+k)$ and $\varphi(n)=\varphi(n+k)$. We give new upper bounds for these solutions.
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