 |  |  |
(1)
|
 |  |  |
(2)
|
where 
is the Euler-Mascheroni constant and
is the En-function
with 
.
Ein Function
See also
En-FunctionExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Ein Function." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/EinFunction.html