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In page Mertens conjecture:

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In 1979, Cohen and Dress found the largest known value of m ( n ) 0.570591 {\displaystyle m(n)\approx 0.570591} for M(7766842813) = 50286, and, in 2011, Kuznetsov found the largest known negative value m ( n ) 0.585768 {\displaystyle m(n)\approx -0.585768} for M(11609864264058592345) = -1995900927.[6] In 2016, Hurst computed M(n) for every n ≤ 1016 but did not find larger values of m(n).[7]