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→Series relations: due to Ramanujan, add link to Rankin–Selberg method |
stale tag, most specific formulas have inline footnotes, and general references do suffice for most of this |
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{{redirect|Robin's theorem|Robbins' theorem in graph theory|Robbins' theorem}}
{{short description|Arithmetic function related to the divisors of an integer}}
[[Image:Divisor.svg|thumb|right|Divisor function σ<sub>0</sub>(''n'') up to ''n'' = 250]]
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