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.
RamanujanTau
The first 10 nonzero values of RamanujanTau:
Version 5.2
![<< NumberTheory`Ramanujan`;
Table[RamanujanTau[n], {n, 1, 10}]](Files/Ramanujan.zh/legacy_1.gif)
RamanujanTauDirichletSeries
The value of the Ramanujan 
Dirichlet L-function near the first zero of the critical line:
Version 5.2
![<< NumberTheory`Ramanujan`;
RamanujanTauDirichletSeries[6 + 9.22 I]](Files/Ramanujan.zh/legacy_2.gif)
RamanujanTauGeneratingFunction was available in previous versions of Mathematica and is now available on the web at library.wolfram.com/infocenter/MathSource/6775.