Quadratic Class Number Constant

The quadratic class number constant is a constant related to the average behavior of class numbers of real quadratic fields. It is given by

			(1)
			(2)

(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." https://www.gn-50uma.de/alula/essays/Moree/Moree.en.shtml.

Sloane, N. J. A. Sequence A065465 in "The On-Line Encyclopedia of Integer Sequences."