Tau-Dirichlet Series
where
is the Ramanujan 
conjectured that all nontrivial zeros of 
lie on theline 
.See also Tau Function
References
Spira, R. ``Calculation of the Ramanujan Tau-Dirichlet Series.'' Math. Comput. 27, 379-385, 1973.
Yoshida, H. ``On Calculations of Zeros of L-Functions Related with Ramanujan's Discriminant Function on the Critical Line.'' J. Ramanujan Math. Soc. 3, 87-95, 1988.
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