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   http://functions.wolfram.com/10.04.17.0002.01
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    RiemannSiegelZ[z + 2 I n] == ((RiemannSiegelZ[z] (4 Pi)^n)/
    Product[Sqrt[(-3 + 4 k - 2 I z) (1 - 4 k + 2 I z)], {k, 1, n}]) 
   (Zeta[I (z + 2 I n) + 1/2]/Zeta[I z + 1/2]) /; 
 Element[n, Integers] && n >= 0 
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   Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["RiemannSiegelZ", "[", RowBox[List["z", "+", RowBox[List["2", "\[ImaginaryI]", " ", "n"]]]], "]"]], "\[Equal]", RowBox[List[FractionBox[RowBox[List[RowBox[List["RiemannSiegelZ", "[", "z", "]"]], SuperscriptBox[RowBox[List["(", RowBox[List["4", "\[Pi]"]], ")"]], "n"]]], RowBox[List[UnderoverscriptBox["\[Product]", RowBox[List["k", "=", "1"]], "n"], SqrtBox[RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["-", "3"]], "+", RowBox[List["4", " ", "k"]], "-", RowBox[List["2", " ", "\[ImaginaryI]", " ", "z"]]]], ")"]], " ", RowBox[List["(", RowBox[List["1", "-", RowBox[List["4", " ", "k"]], "+", RowBox[List["2", " ", "\[ImaginaryI]", " ", "z"]]]], ")"]]]]]]]], FractionBox[RowBox[List["Zeta", "[", RowBox[List[RowBox[List["\[ImaginaryI]", " ", RowBox[List["(", RowBox[List["z", "+", RowBox[List["2", "\[ImaginaryI]", " ", "n"]]]], ")"]]]], "+", FractionBox["1", "2"]]], "]"]], RowBox[List["Zeta", "[", RowBox[List[RowBox[List["\[ImaginaryI]", " ", "z"]], "+", FractionBox["1", "2"]]], "]"]]]]]]], "/;", RowBox[List[RowBox[List["n", "\[Element]", "Integers"]], "\[And]", RowBox[List["n", "\[GreaterEqual]", "0"]]]]]]]] 
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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>  <mrow>  <semantics>  <mi> Z </mi>  <annotation encoding='Mathematica'> TagBox["Z", RiemannSiegelZ] </annotation>  </semantics>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> + </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> n </mi>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mrow>  <mfrac>  <mrow>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <mn> 4 </mn>  <mo> ⁢ </mo>  <mi> π </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mi> n </mi>  </msup>  <mo> ⁢ </mo>  <semantics>  <mrow>  <mi> ζ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> n </mi>  </mrow>  <mo> + </mo>  <mi> z </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <mo> + </mo>  <mfrac>  <mn> 1 </mn>  <mn> 2 </mn>  </mfrac>  </mrow>  <mo> ) </mo>  </mrow>  <annotation encoding='Mathematica'> TagBox[RowBox[List["\[Zeta]", "(", TagBox[RowBox[List[RowBox[List["\[ImaginaryI]", " ", RowBox[List["(", RowBox[List[RowBox[List["2", " ", "\[ImaginaryI]", " ", "n"]], "+", "z"]], ")"]]]], "+", FractionBox["1", "2"]]], Rule[Editable, True]], ")"]], InterpretTemplate[Function[$CellContext`e, Zeta[$CellContext`e]]]] </annotation>  </semantics>  </mrow>  <mrow>  <mrow>  <mo> ( </mo>  <mrow>  <munderover>  <mo> ∏ </mo>  <mrow>  <mi> k </mi>  <mo> = </mo>  <mn> 1 </mn>  </mrow>  <mi> n </mi>  </munderover>  <msqrt>  <mrow>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mn> 4 </mn>  <mo> ⁢ </mo>  <mi> k </mi>  </mrow>  <mo> - </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> z </mi>  </mrow>  <mo> - </mo>  <mn> 3 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mrow>  <mn> 4 </mn>  <mo> ⁢ </mo>  <mi> k </mi>  </mrow>  <mo> + </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> z </mi>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </msqrt>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <semantics>  <mrow>  <mi> ζ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> z </mi>  </mrow>  <mo> + </mo>  <mfrac>  <mn> 1 </mn>  <mn> 2 </mn>  </mfrac>  </mrow>  <mo> ) </mo>  </mrow>  <annotation encoding='Mathematica'> TagBox[RowBox[List["\[Zeta]", "(", TagBox[RowBox[List[RowBox[List["\[ImaginaryI]", " ", "z"]], "+", FractionBox["1", "2"]]], Rule[Editable, True]], ")"]], InterpretTemplate[Function[$CellContext`e, Zeta[$CellContext`e]]]] </annotation>  </semantics>  </mrow>  </mfrac>  <mo> ⁢ </mo>  <mrow>  <semantics>  <mi> Z </mi>  <annotation encoding='Mathematica'> TagBox["Z", RiemannSiegelZ] </annotation>  </semantics>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <mtext>   </mtext>  <mo> /; </mo>  <mrow>  <mi> n </mi>  <mo> ∈ </mo>  <mi> ℕ </mi>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Condition </ci>  <apply>  <eq />  <apply>  <ci> RiemannSiegelZ </ci>  <apply>  <plus />  <ci> z </ci>  <apply>  <times />  <cn type='integer'> 2 </cn>  <imaginaryi />  <ci> n </ci>  </apply>  </apply>  </apply>  <apply>  <times />  <apply>  <times />  <apply>  <power />  <apply>  <times />  <cn type='integer'> 4 </cn>  <pi />  </apply>  <ci> n </ci>  </apply>  <apply>  <ci> Zeta </ci>  <apply>  <plus />  <apply>  <times />  <imaginaryi />  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 2 </cn>  <imaginaryi />  <ci> n </ci>  </apply>  <ci> z </ci>  </apply>  </apply>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  </apply>  <apply>  <power />  <apply>  <times />  <apply>  <product />  <bvar>  <ci> k </ci>  </bvar>  <lowlimit>  <cn type='integer'> 1 </cn>  </lowlimit>  <uplimit>  <ci> n </ci>  </uplimit>  <apply>  <power />  <apply>  <times />  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 4 </cn>  <ci> k </ci>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <cn type='integer'> 2 </cn>  <imaginaryi />  <ci> z </ci>  </apply>  </apply>  <cn type='integer'> -3 </cn>  </apply>  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <cn type='integer'> 4 </cn>  <ci> k </ci>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> 2 </cn>  <imaginaryi />  <ci> z </ci>  </apply>  </apply>  </apply>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  </apply>  <apply>  <ci> Zeta </ci>  <apply>  <plus />  <apply>  <times />  <imaginaryi />  <ci> z </ci>  </apply>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <ci> RiemannSiegelZ </ci>  <ci> z </ci>  </apply>  </apply>  </apply>  <apply>  <in />  <ci> n </ci>  <ci> ℕ </ci>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["RiemannSiegelZ", "[", RowBox[List["z_", "+", RowBox[List["2", " ", "\[ImaginaryI]", " ", "n_"]]]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[FractionBox[RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["RiemannSiegelZ", "[", "z", "]"]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["4", " ", "\[Pi]"]], ")"]], "n"]]], ")"]], " ", RowBox[List["Zeta", "[", RowBox[List[RowBox[List["\[ImaginaryI]", " ", RowBox[List["(", RowBox[List["z", "+", RowBox[List["2", " ", "\[ImaginaryI]", " ", "n"]]]], ")"]]]], "+", FractionBox["1", "2"]]], "]"]]]], RowBox[List[RowBox[List["(", RowBox[List[UnderoverscriptBox["\[Product]", RowBox[List["k", "=", "1"]], "n"], SqrtBox[RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["-", "3"]], "+", RowBox[List["4", " ", "k"]], "-", RowBox[List["2", " ", "\[ImaginaryI]", " ", "z"]]]], ")"]], " ", RowBox[List["(", RowBox[List["1", "-", RowBox[List["4", " ", "k"]], "+", RowBox[List["2", " ", "\[ImaginaryI]", " ", "z"]]]], ")"]]]]]]], ")"]], " ", RowBox[List["Zeta", "[", RowBox[List[RowBox[List["\[ImaginaryI]", " ", "z"]], "+", FractionBox["1", "2"]]], "]"]]]]], "/;", RowBox[List[RowBox[List["n", "\[Element]", "Integers"]], "&&", RowBox[List["n", "\[GreaterEqual]", "0"]]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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