MathSciNet bibliographic data MR46375 10.0X de Bruijn, N. G. On the number of positive integers $\leq x$$\leq x$ and free of prime factors $>y$$>y$. Nederl. Acad. Wetensch. Proc. Ser. A. 54, (1951). 50–60. Links to the journal or article are not yet available

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