Some remark on Euler's φ function
Paul Erdös (1958)
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Paul Erdös (1958)
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P. Elliott (1967)
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C. Hooley (1998)
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Enrico Bombieri (1976)
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P. Erdös, G. Jogesh Babu, K. Ramachandra (1976)
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H. Davenport (1971)
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