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(-(E^(k1*x)*(2 + k1*x + k1^2*x^2)) + k1^3*x^3*ExpIntegralEi[k1*x])/(6*x^3)

Integrate[Exp[k1*x]/x^4, x] ==
(-(E^(k1*x)*(2 + k1*x + k1^2*x^2)) + k1^3*x^3*ExpIntegralEi[k1*x])/(6*x^3) 

          Exp[k1 x]
Integrate[---------, x] == 
              4
             x

    k1 x               2  2
(-(E     (2 + k1 x + k1  x )) + 
 
      3  3                            3
    k1  x  ExpIntegralEi[k1 x]) / (6 x )
Time to compute: 0.02 second
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