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Question Number 144700 by mathmax by abdo last updated on 28/Jun/21
$$\mathrm{find}\:\sum_{\mathrm{n}=\mathrm{1}} ^{\infty} \:\frac{\mathrm{x}^{\mathrm{n}} }{\mathrm{n}^{\mathrm{2}} } \\ $$
Answered by qaz last updated on 28/Jun/21
$$\mathrm{Li}_{\mathrm{2}} \left(\mathrm{x}\right) \\ $$