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http://functions.wolfram.com/06.16.23.0013.01
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Sum[(HarmonicNumber[k]/k^3) Cos[(Pi k)/3], {k, 1, Infinity}] == (17 Pi^4)/4860
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Cell[BoxData[RowBox[List[RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "1"]], "\[Infinity]"], RowBox[List[FractionBox[RowBox[List["HarmonicNumber", "[", "k", "]"]], SuperscriptBox["k", "3"]], RowBox[List["Cos", "[", FractionBox[RowBox[List["\[Pi]", " ", "k"]], "3"], "]"]]]]]], "\[Equal]", FractionBox[RowBox[List["17", SuperscriptBox["\[Pi]", "4"]]], "4860"]]]]]
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<math xmlns='http://www.w3.org/1998/Math/MathML' mathematica:form='TraditionalForm' xmlns:mathematica='http://www.wolfram.com/XML/'> <semantics> <mrow> <mrow> <munderover> <mo> ∑ </mo> <mrow> <mi> k </mi> <mo> = </mo> <mn> 1 </mn> </mrow> <mi> ∞ </mi> </munderover> <mrow> <mfrac> <mrow> <msub> <semantics> <mi> H </mi> <annotation-xml encoding='MathML-Content'> <ci> HarmonicNumber </ci> </annotation-xml> </semantics> <mi> k </mi> </msub> <mtext> </mtext> </mrow> <msup> <mi> k </mi> <mn> 3 </mn> </msup> </mfrac> <mo> ⁢ </mo> <mrow> <mi> cos </mi> <mo> ⁡ </mo> <mo> ( </mo> <mfrac> <mrow> <mi> π </mi> <mo> ⁢ </mo> <mi> k </mi> </mrow> <mn> 3 </mn> </mfrac> <mo> ) </mo> </mrow> </mrow> </mrow> <mo>  </mo> <mfrac> <mrow> <mn> 17 </mn> <mo> ⁢ </mo> <msup> <mi> π </mi> <mn> 4 </mn> </msup> </mrow> <mn> 4860 </mn> </mfrac> </mrow> <annotation-xml encoding='MathML-Content'> <apply> <eq /> <apply> <sum /> <bvar> <ci> k </ci> </bvar> <lowlimit> <cn type='integer'> 1 </cn> </lowlimit> <uplimit> <infinity /> </uplimit> <apply> <times /> <apply> <times /> <apply> <ci> HarmonicNumber </ci> <ci> k </ci> </apply> <apply> <power /> <apply> <power /> <ci> k </ci> <cn type='integer'> 3 </cn> </apply> <cn type='integer'> -1 </cn> </apply> </apply> <apply> <cos /> <apply> <times /> <pi /> <ci> k </ci> <apply> <power /> <cn type='integer'> 3 </cn> <cn type='integer'> -1 </cn> </apply> </apply> </apply> </apply> </apply> <apply> <times /> <cn type='integer'> 17 </cn> <apply> <power /> <pi /> <cn type='integer'> 4 </cn> </apply> <apply> <power /> <cn type='integer'> 4860 </cn> <cn type='integer'> -1 </cn> </apply> </apply> </apply> </annotation-xml> </semantics> </math>
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| Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k_", "=", "1"]], "\[Infinity]"], FractionBox[RowBox[List[RowBox[List["HarmonicNumber", "[", "k_", "]"]], " ", RowBox[List["Cos", "[", FractionBox[RowBox[List["\[Pi]", " ", "k_"]], "3"], "]"]]]], SuperscriptBox["k_", "3"]]]], "]"]], "\[RuleDelayed]", FractionBox[RowBox[List["17", " ", SuperscriptBox["\[Pi]", "4"]]], "4860"]]]]] |
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Date Added to functions.wolfram.com (modification date)
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