Sum[(Binomial[k + n, 2 k] BernoulliB[k])/(k + n), {k, 0, n}] == 3/4 /; Mod[k, 12] == 1

Cell[BoxData[RowBox[List[RowBox[List[RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "0"]], "n"], FractionBox[RowBox[List[RowBox[List["Binomial", "[", RowBox[List[RowBox[List["k", "+", "n"]], ",", RowBox[List["2", " ", "k"]]]], "]"]], " ", RowBox[List["BernoulliB", "[", "k", "]"]]]], RowBox[List["k", "+", "n"]]]]], "\[Equal]", FractionBox["3", "4"]]], "/;", RowBox[List[RowBox[List["Mod", "[", RowBox[List["k", ",", "12"]], "]"]], "\[Equal]", "1"]]]]]]

<math xmlns='http://www.w3.org/1998/Math/MathML' mathematica:form='TraditionalForm' xmlns:mathematica='http://www.wolfram.com/XML/'> <semantics> <mrow> <mrow> <mrow> <munderover> <mo> &#8721; </mo> <mrow> <mi> k </mi> <mo> = </mo> <mn> 0 </mn> </mrow> <mi> n </mi> </munderover> <mrow> <semantics> <mrow> <mo> ( </mo> <mtable> <mtr> <mtd> <mrow> <mi> k </mi> <mo> + </mo> <mi> n </mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mn> 2 </mn> <mo> &#8290; </mo> <mi> k </mi> </mrow> </mtd> </mtr> </mtable> <mo> ) </mo> </mrow> <annotation encoding='Mathematica'> TagBox[RowBox[List[&quot;(&quot;, GridBox[List[List[TagBox[RowBox[List[&quot;k&quot;, &quot;+&quot;, &quot;n&quot;]], Identity, Rule[Editable, True]]], List[TagBox[RowBox[List[&quot;2&quot;, &quot; &quot;, &quot;k&quot;]], Identity, Rule[Editable, True]]]]], &quot;)&quot;]], InterpretTemplate[Function[Binomial[Slot[1], Slot[2]]]], Rule[Editable, False]] </annotation> </semantics> <mo> &#8290; </mo> <mfrac> <msub> <semantics> <mi> B </mi> <annotation encoding='Mathematica'> TagBox[&quot;B&quot;, BernoulliB] </annotation> </semantics> <mi> k </mi> </msub> <mrow> <mi> k </mi> <mo> + </mo> <mi> n </mi> </mrow> </mfrac> </mrow> </mrow> <mo> &#10869; </mo> <mfrac> <mn> 3 </mn> <mn> 4 </mn> </mfrac> </mrow> <mo> /; </mo> <mrow> <semantics> <mrow> <mi> k </mi> <mo> &#8290; </mo> <mi> mod </mi> <mo> &#8290; </mo> <mn> 12 </mn> </mrow> <annotation-xml encoding='MathML-Content'> <apply> <rem /> <ci> $CellContext`k </ci> <cn type='integer'> 12 </cn> </apply> </annotation-xml> </semantics> <mo> &#10869; </mo> <mn> 1 </mn> </mrow> </mrow> <annotation-xml encoding='MathML-Content'> <apply> <ci> Condition </ci> <apply> <eq /> <apply> <sum /> <bvar> <ci> k </ci> </bvar> <lowlimit> <cn type='integer'> 0 </cn> </lowlimit> <uplimit> <ci> n </ci> </uplimit> <apply> <times /> <apply> <ci> Binomial </ci> <apply> <plus /> <ci> k </ci> <ci> n </ci> </apply> <apply> <times /> <cn type='integer'> 2 </cn> <ci> k </ci> </apply> </apply> <apply> <times /> <apply> <ci> BernoulliB </ci> <ci> k </ci> </apply> <apply> <power /> <apply> <plus /> <ci> k </ci> <ci> n </ci> </apply> <cn type='integer'> -1 </cn> </apply> </apply> </apply> </apply> <cn type='rational'> 3 <sep /> 4 </cn> </apply> <apply> <eq /> <apply> <rem /> <ci> $CellContext`k </ci> <cn type='integer'> 12 </cn> </apply> <cn type='integer'> 1 </cn> </apply> </apply> </annotation-xml> </semantics> </math>

Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k_", "=", "0"]], "n_"], FractionBox[RowBox[List[RowBox[List["Binomial", "[", RowBox[List[RowBox[List["k_", "+", "n_"]], ",", RowBox[List["2", " ", "k_"]]]], "]"]], " ", RowBox[List["BernoulliB", "[", "k_", "]"]]]], RowBox[List["k_", "+", "n_"]]]]], "]"]], "\[RuleDelayed]", RowBox[List[FractionBox["3", "4"], "/;", RowBox[List[RowBox[List["Mod", "[", RowBox[List["k", ",", "12"]], "]"]], "\[Equal]", "1"]]]]]]]]

2001-10-29