RamanujanTau, RamanujanTauTheta, and RamanujanTauZ have been added to the built-in Mathematica kernel.
RamanujanTauDirichletSeries is now available as the newly added built-in Mathematica kernel function RamanujanTauL.
The first 10 nonzero values of RamanujanTau:
The value of the Ramanujan Dirichlet L-function near the first zero of the critical line:
RamanujanTauGeneratingFunction was available in previous versions of Mathematica and is now available on the web at library.wolfram.com/infocenter/MathSource/6775.