DLMF:8.19.E24 (Q2710)

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DLMF:8.19.E24
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    0 e - a t E n ( t ) d t = ( - 1 ) n - 1 a n ( ln ( 1 + a ) + k = 1 n - 1 ( - 1 ) k a k k ) , superscript subscript 0 superscript 𝑒 𝑎 𝑡 exponential-integral-En 𝑛 𝑡 𝑡 superscript 1 𝑛 1 superscript 𝑎 𝑛 1 𝑎 superscript subscript 𝑘 1 𝑛 1 superscript 1 𝑘 superscript 𝑎 𝑘 𝑘 {\displaystyle{\displaystyle\int_{0}^{\infty}e^{-at}E_{n}\left(t\right)\mathrm% {d}t=\frac{(-1)^{n-1}}{a^{n}}\left(\ln\left(1+a\right)+\sum_{k=1}^{n-1}\frac{(% -1)^{k}a^{k}}{k}\right),}}
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    a > - 1 𝑎 1 {\displaystyle{\displaystyle\Re a>-1}}
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