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Date: 18-8-2020
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The Feller-Tornier constant is the density of integers that have an even number of prime factors with in their prime factorization. It is given by
(1) |
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(2) |
(OEIS A065493), where is the th prime. It can be given by the sum
(3) |
where is the prime zeta function.
REFERENCES:
Cohen, E. "Some Asymptotic Formulas in the Theory of Numbers." Trans. Amer. Math. Soc. 112, 214-227, 1964.
Feller, W. and Tornier, E. "Mengentheoretische Untersuchungen von Eigenschaften der Zahlenreihe." Math. Ann. 107, 188-232, 1933.
Finch, S. R. Mathematical Constants. Cambridge, England: Cambridge University Press, p. 106, 2003.
Niklasch, G. "Some Number-Theoretical Constants." http://www.gn-50uma.de/alula/essays/Moree/Moree.en.shtml.
Schoenberg, I. J. "On Asymptotic Distributions of Arithmetical Functions." Trans. Amer. Math. Soc. 39, 315-330, 1936.
Sloane, N. J. A. Sequence A065493 in "The On-Line Encyclopedia of Integer Sequences."
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