hi any idea about the sum

$\displaystyle \sum _{n=1}^{\infty } \frac{(-1)^n}{\sqrt{a+n} n^4}$

a complex number

thanks

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- Sep 20th 2011, 02:18 AMcapeasum series
hi any idea about the sum

$\displaystyle \sum _{n=1}^{\infty } \frac{(-1)^n}{\sqrt{a+n} n^4}$

a complex number

thanks