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   http://functions.wolfram.com/10.01.08.0001.01
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    Zeta[s] == Product[1/(1 - Subscript[p, k]^(-s)), {k, 1, Infinity}] /; 
 Re[s] > 1 && Subscript[p, k] == Prime[k] 
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   Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["Zeta", "[", "s", "]"]], "\[Equal]", " ", RowBox[List[UnderoverscriptBox["\[Product]", RowBox[List["k", "=", "1"]], "\[Infinity]"], FractionBox["1", RowBox[List["1", "-", SubsuperscriptBox["p", "k", RowBox[List["-", "s"]]]]]]]]]], "/;", RowBox[List[RowBox[List[RowBox[List["Re", "[", "s", "]"]], ">", "1"]], "\[And]", RowBox[List[SubscriptBox["p", "k"], "\[Equal]", RowBox[List["Prime", "[", "k", "]"]]]]]]]]]] 
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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>  <semantics>  <mrow>  <mi> ζ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> s </mi>  <mo> ) </mo>  </mrow>  <annotation encoding='Mathematica'> TagBox[RowBox[List["\[Zeta]", "(", TagBox["s", Rule[Editable, True]], ")"]], InterpretTemplate[Function[$CellContext`e, Zeta[$CellContext`e]]]] </annotation>  </semantics>  <mo> ⩵ </mo>  <mrow>  <munderover>  <mo> ∏ </mo>  <mrow>  <mi> k </mi>  <mo> = </mo>  <mn> 1 </mn>  </mrow>  <mi> ∞ </mi>  </munderover>  <mfrac>  <mn> 1 </mn>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <msubsup>  <mi> p </mi>  <mi> k </mi>  <mrow>  <mo> - </mo>  <mi> s </mi>  </mrow>  </msubsup>  </mrow>  </mfrac>  </mrow>  </mrow>  <mo> /; </mo>  <mrow>  <mrow>  <mrow>  <mi> Re </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> s </mi>  <mo> ) </mo>  </mrow>  <mo> > </mo>  <mn> 1 </mn>  </mrow>  <mo> ∧ </mo>  <mrow>  <msub>  <mi> p </mi>  <mi> k </mi>  </msub>  <mo> ⩵ </mo>  <mrow>  <mi> prime </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> k </mi>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Condition </ci>  <apply>  <eq />  <apply>  <ci> Zeta </ci>  <ci> s </ci>  </apply>  <apply>  <product />  <bvar>  <ci> k </ci>  </bvar>  <lowlimit>  <cn type='integer'> 1 </cn>  </lowlimit>  <uplimit>  <infinity />  </uplimit>  <apply>  <times />  <cn type='integer'> 1 </cn>  <apply>  <power />  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <power />  <apply>  <ci> Subscript </ci>  <ci> p </ci>  <ci> k </ci>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> s </ci>  </apply>  </apply>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  <apply>  <and />  <apply>  <gt />  <apply>  <real />  <ci> s </ci>  </apply>  <cn type='integer'> 1 </cn>  </apply>  <apply>  <eq />  <apply>  <ci> Subscript </ci>  <ci> p </ci>  <ci> k </ci>  </apply>  <apply>  <ci> prime </ci>  <ci> k </ci>  </apply>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Zeta", "[", "s_", "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List[UnderoverscriptBox["\[Product]", RowBox[List["k", "=", "1"]], "\[Infinity]"], FractionBox["1", RowBox[List["1", "-", SubsuperscriptBox["p", "k", RowBox[List["-", "s"]]]]]]]], "/;", RowBox[List[RowBox[List[RowBox[List["Re", "[", "s", "]"]], ">", "1"]], "&&", RowBox[List[SubscriptBox["p", "k"], "\[Equal]", RowBox[List["Prime", "[", "k", "]"]]]]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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