Ramanujan-Eisenstein Series

Let be a discriminant,

(1)

			(2)
			(3)
			(4)

References

Borwein, J. M. and Borwein, P. B. ``Class Number Three Ramanujan Type Series for .'' J. Comput. Appl. Math. 46, 281-290, 1993.

Ramanujan, S. ``Modular Equations and Approximations to .'' Quart. J. Pure Appl. Math. 45, 350-372, 1913-1914.

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