DLMF:27.11.E4 (Q8073)

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DLMF:27.11.E4
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    Defining formula
    ∑ n ≤ x σ 1 ⁡ ( n ) = π 2 12 ⁢ x 2 + O ⁡ ( x ⁢ ln ⁡ x ) . subscript 𝑛 𝑥 divisor-sigma 1 𝑛 2 12 superscript 𝑥 2 Big-O 𝑥 𝑥 {\displaystyle{\displaystyle\sum_{n\leq x}\sigma_{1}\left(n\right)=\frac{{\pi^% {2}}}{12}x^{2}+O\left(x\ln x\right).}}
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    DLMF id
    DLMF:27.11.E4
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