gamma(a-1)-x^(a-1)/((a-1)e^x) Sum[(x^k Pochhammer[1, k])/(k! Pochhammer[a, k]), {k, 0, Infinity}]gamma(a-1)-x^(a-1)/((a-1)e^x) Sum[(x^k Pochhammer[1, k])/(k! Pochhammer[a, k]), {k, 0, Infinity}]

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