DLMF:27.13.E7 (Q8099)

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DLMF:27.13.E7
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    Defining formula
    r 2 ⁡ ( n ) = 4 ⁢ ( δ 1 ⁢ ( n ) - δ 3 ⁢ ( n ) ) . number-of-squares-R 2 𝑛 4 subscript 𝛿 1 𝑛 subscript 𝛿 3 𝑛 {\displaystyle{\displaystyle r_{2}\left(n\right)=4\left(\delta_{1}(n)-\delta_{% 3}(n)\right).}}
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    DLMF id
    DLMF:27.13.E7
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