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is true for infinitely many values of {{mvar|n}}, see {{OEIS2C|A005237}}.
=== Dirichlet convolutions ===
{{Main article|Dirichlet convolution}}
By definition:<math display="block">\sigma = \operatorname{Id} * \mathbf 1</math>By [[Möbius inversion formula|Möbius inversion]]:
<math>\operatorname{Id} = \sigma * \mu </math>
==Series relations==
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