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Compute Dirichlet Transforms
Compute a Dirichlet L-series.
In[1]:=

Click for copyable input
DirichletTransform[Mod[n, 5], n, 1/2 + I t]
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In[2]:=

Click for copyable input
DirichletTransform[Mod[n, 5], n, 1/2 + I t];

Plot[Re[%], {t, -10, 10}]
Out[2]=