On and .
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Chen, Yong-Gao, Fang, Jin-Hui (2008)
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Florian Luca, Francesco Pappalardi (2007)
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Shi-Chao Chen, Yong-Gao Chen (2004)
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We prove an Ω result on the average of the sum of the divisors of n which are relatively coprime to any given integer a. This generalizes the earlier result for a prime proved by Adhikari, Coppola and Mukhopadhyay.
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Ayad, Mohamed, Kihel, Omar (2009)
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Marco Riccardi (2006)
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The first four sections of this article include some auxiliary theorems related to number and finite sequence of numbers, in particular a primality test, the Pocklington's theorem (see [19]). The last section presents the formalization of Bertrand's postulate closely following the book [1], pp. 7-9.
Ayad, Mohamed, Kihel, Omar (2008)
Journal of Integer Sequences [electronic only]
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