DirichletLambda

DirichletLambda[s] gives the Dirichlet lambda function λ(s).

Examples

Evaluate at specific points:

DirichletLambda[2]
(* Pi^2/8 *)

Numerical value:

N[DirichletLambda[4]]
(* 1.01467 *)

Please visit the official Wolfram Language Reference for more details.