The Mertens function reference article from the English Wikipedia on 24-Apr-2004
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Mertens function

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In number theory, the Mertens function is

where μ(k) is the Möbius function.

See also: Mertens conjecture

External Links

Values of the Mertens function for the first 50 n are given by SIDN A002321.

Values of the Mertens function for the first 2500 n are given by PrimeFan's Mertens Values Page