The En(n,z) in Math. Defined by

\[ En(n,z) = \int_1^\infty \frac{exp(-z*t)}{t^n} = z^{(n-1)} \Gamma (1-n,z) \]

\[ En(1,z) = \Gamma (0,z) = -Ei(-x) \]

En(x,y) in 3D graph.

Real part on the real axis:

Imaginary part on the real axis:

Real part on the imaginary axis:

Imaginary part on the imaginary axis:

Real part on the complex plane:

Imaginary part on the complex plane:

Absolute value on the complex plane:

Related functions: log

Function category: logarithmic functions