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 On the denominators of $\varepsilon$-harmonic numbers Bull. Korean Math. Soc.Published online September 1, 2020 Bing-Ling Wu and Xiao-Hui Yan Changzhou University, Anhui Normal University Abstract : Let $H_n$ be the $n$-th harmonic number and let $v_n$ be its denominator. Shiu has proved that there are infinite many positive integers $n$ with $v_n =v_{n+1}$. Recently, Wu and Chen have proved that the set of positive integers $n$ with $v_n = v_{n+1}$ has density one. They also have proved that the same result is true for the denominators of alternating harmonic numbers. In this paper, we prove that the result is true for the denominators of $\varepsilon$-harmonic numbers, where $\varepsilon=\{ \varepsilon_i \}_{i=1}^\infty$ is a pure recurring sequence with $\varepsilon_i\in \{-1,1\}$. Keywords : $p$-adic valuation; Asymptotic density; Recurring sequences MSC numbers : 11B75,11B83 Full-Text :