RosettaCodeData/Task/Mertens-function/Mathematica/mertens-function.math

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ClearAll[Mertens]
Mertens[n_] := Total[MoebiusMu[Range[n]]]
Grid[Partition[Mertens /@ Range[99], UpTo[10]]]
Count[Mertens /@ Range[1000], 0]
SequenceCount[Mertens /@ Range[1000], {Except[0], 0}]