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Date: 26-1-2021
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The quadratic class number constant is a constant related to the average behavior of class numbers of real quadratic fields. It is given by
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(OEIS A065465), where the product is over the primes .
REFERENCES:
Cohen, H. A Course in Computational Algebraic Number Theory. New York:Springer-Verlag, p. 291, 1993.
Finch, S. R. Mathematical Constants. Cambridge, England: Cambridge University Press, p. 107, 2003.
Niklasch, G. "Some Number-Theoretical Constants." http://www.gn-50uma.de/alula/essays/Moree/Moree.en.shtml.
Sloane, N. J. A. Sequence A065465 in "The On-Line Encyclopedia of Integer Sequences."
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