Cesàro means related to the square of the divisor function
Gintautas Bareikis, Algirdas Mačiulis (2012)
Acta Arithmetica
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Gintautas Bareikis, Algirdas Mačiulis (2012)
Acta Arithmetica
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Y.-F. S. Pétermann (2004)
Acta Arithmetica
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Fukuda, Shigetaka (2002)
International Journal of Mathematics and Mathematical Sciences
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Nicholas Buchdahl (2000)
Annales de l'institut Fourier
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A version of the classical Nakai-Moishezon criterion is proved for all compact complex surfaces, regardless of the parity of the first Betti number.
Florian Luca, Carl Pomerance (2015)
Acta Arithmetica
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Answering a question of Erdős, we show that a positive proportion of even numbers are in the form s(n), where s(n) = σ(n) - n, the sum of proper divisors of n.
Suryanarayana, D., Prasad, V. Siva Rama (1974)
Portugaliae mathematica
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Leif Abrahamsson (1982)
Bulletin de la Société Mathématique de France
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Stoll, Wilhelm (1983)
International Journal of Mathematics and Mathematical Sciences
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Massimiliano Mella (1999)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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Fernando Serrano (1987)
Mathematische Annalen
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