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Does anybody know where I can find Ramanujan's paper from 1918 titled "On Certain Arithmetical Functions." It is referenced in wikipedia, under the Ramanujan Summation section, but I cannot find a link to it. It is supposed to contain proofs to some interesting identities.

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Ramanujan's Collected Papers are available at http://www.imsc.res.in/~rao/ramanujan/collectedindex.html.

The paper you seek is available at http://www.imsc.res.in/~rao/ramanujan/CamUnivCpapers/Cpaper18/page1.htm but it's from 1916 not 1918.

lhf
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I would suggest Ramanujan's collected works.

Igor Rivin
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