In the following form of the Exponential Integral function;
$$ E_{n}(x+c) $$
where $E_{n}(x+c)$ is the exponential integral function, $x\in\mathbb{R}^+$ , $n\in\mathbb{N}$ , $c$ is a constant
Is it possible to take out the constant part $c$ from the function? If yes, How?