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A. P. Minin, <a href="http://www.mathnet.ru/php/archive.phtml?wshow=paper&jrnid=sm&paperid"On integers N such that the number of divisors of N equals the number of integers less than N and prime to it"</a> , Math. Soc. Moscow, Vol. 17, (1894), pp. 537-544 (some front matter is in English and German, article is in Russian)
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(MAGMAMagma) [n: n in [1..1000] | EulerPhi(n) eq NumberOfDivisors(n)]; // Marius A. Burtea, Dec 20 2018
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G. Polya Pólya and G. Szego, Szegő, Problems and Theorems in Analysis II, Springer, 1976, Part VIII, Problem 45.
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