MHB Definite integral challenge....

[DreamWeaver]

For $$m \in \mathbb{Z}^+$$, and $$a, \, z \in \mathbb{R} > 0$$, evaluate the definite integral:$$\int_0^z\frac{x^m}{(a+\log x)}\,dx$$[I'll be adding a few generalized forms like this in the logarithmic integrals thread, in Maths Notes, shortly... (Heidy) ]

 

[polygamma]

You can find an antiderivative in terms of the exponential integral.$ \displaystyle \int \frac{x^{m}}{a+\ln x} \ dx = \int \frac{e^{u(m+1)}}{a+u} \ du = e^{-a(m+1)} \int \frac{e^{m(w+1)}}{w} \ dw $

$ \displaystyle = e^{-a(m+1)} \ \text{Ei} \Big( w(m+1) \Big) + C $

$ \displaystyle = e^{-a(m+1)} \ \text{Ei} \Big( (a+u) (m+1) \Big) + C $

$ \displaystyle = e^{-a(m+1)} \ \text{Ei} \Big( (a+\ln x) (m+1) \Big) + C $And I think you need more restrictions on the parameters to guarantee convergence.