On positive integers \(n\) such that \(\varphi(1)+\varphi(2)+\cdots+ \varphi(n)\) is a square
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Publication:1959044
zbMath1211.11005MaRDI QIDQ1959044
Florian Luca, Ayyadurai Sankaranarayanan
Publication date: 1 October 2010
Published in: Boletín de la Sociedad Matemática Mexicana. Third Series (Search for Journal in Brave)
Applications of sieve methods (11N36) Arithmetic functions; related numbers; inversion formulas (11A25)
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