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Question Number 135143 by mnjuly1970 last updated on 10/Mar/21

                .....nice   calculus...          please  calculate:↓↓↓               :::  𝛗=^(??) Σ_(n=1) ^∞ (H_n ^^2  /n^2 )

$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:.....{nice}\:\:\:{calculus}... \\ $$$$\:\:\:\:\:\:\:\:{please}\:\:{calculate}:\downarrow\downarrow\downarrow \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\::::\:\:\boldsymbol{\phi}\overset{??} {=}\underset{{n}=\mathrm{1}} {\overset{\infty} {\sum}}\frac{{H}_{{n}} ^{\:^{\mathrm{2}} } }{{n}^{\mathrm{2}} }\:\: \\ $$$$\:\:\:\:\:\: \\ $$

Commented by mnjuly1970 last updated on 10/Mar/21

  thank you mr payan

$$\:\:{thank}\:{you}\:{mr}\:{payan}\:\: \\ $$$$\: \\ $$

Commented by Dwaipayan Shikari last updated on 10/Mar/21

((17π^4 )/(360))

$$\frac{\mathrm{17}\pi^{\mathrm{4}} }{\mathrm{360}} \\ $$

Commented by Dwaipayan Shikari last updated on 10/Mar/21

https://math.stackexchange.com/a/904248 I have found this here

Commented by mnjuly1970 last updated on 10/Mar/21

  thank you so much mr payan..

$$\:\:{thank}\:{you}\:{so}\:{much}\:{mr}\:{payan}.. \\ $$$$\:\: \\ $$

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