Limit to Infinity of Summation of Euler Phi Function over Square/Historical Note
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Historical Note on Limit to Infinity of Summation of Euler Phi Function over Square
This result was cited by Leonard Eugene Dickson in his History of the Theory of Numbers, Volume I of $1919$.
He attributed it to J. Perrot about whom nothing can be found.
Sources
- 1983: François Le Lionnais and Jean Brette: Les Nombres Remarquables ... (previous) ... (next): $0,30396 35509 \ldots$