Artin constant
From specialfunctionswiki
The Artin constant is given by $$C_{\mathrm{Artin}} = \displaystyle\prod_{k=1}^{\infty} 1- \dfrac{1}{p_k(p_k-1)},$$ where $p_k$ denotes the $k$th prime number.
The Artin constant is given by $$C_{\mathrm{Artin}} = \displaystyle\prod_{k=1}^{\infty} 1- \dfrac{1}{p_k(p_k-1)},$$ where $p_k$ denotes the $k$th prime number.
