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Feller–Tornier constant
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In mathematics, the Feller–Tornier constant CFT is the density of the set of all positive integers that have an even number of distinct prime factors raised to a power larger than one (ignoring any prime factors which appear only to the first power).[1] It is named after William Feller (1906–1970) and Erhard Tornier (1894–1982)[2]
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Omega function
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The Big Omega function is given by
See also: Prime omega function.
The Iverson bracket is
With these notations, we have
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Prime zeta function
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The prime zeta function P is give by
The Feller–Tornier constant satisfies
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