Convergence in B-spaces
D. Adnađević (1984)
Matematički Vesnik
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D. Adnađević (1984)
Matematički Vesnik
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M. R. Tasković (1971)
Matematički Vesnik
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B. Choczewski (1971)
Annales Polonici Mathematici
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Agratini, Octavian (1998)
General Mathematics
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Yuk-Kam Lau (2001)
Acta Arithmetica
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Florian Cajori (1893)
Bulletin of the New York Mathematical Society
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Dana Fraňková (1989)
Časopis pro pěstování matematiky
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G. Eneström (1893/94)
Bulletin of the New York Mathematical Society
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Tadeusz Jankowski (1971)
Annales Polonici Mathematici
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Y.-F. S. Pétermann (2004)
Acta Arithmetica
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Hans Jarchow (1973)
Publications du Département de mathématiques (Lyon)
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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.
Shi-Chao Chen, Yong-Gao Chen (2004)
Colloquium Mathematicae
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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.