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 Prime

 http://functions.wolfram.com/13.03.24.0002.01

 Input Form

 Product[(Subscript[p, k]^2 + 1)/(Subscript[p, k]^2 - 1), {k, 1, Infinity}] == 5/2 /; Subscript[p, k] == Prime[k]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List[UnderoverscriptBox["\[Product]", RowBox[List["k", "=", "1"]], "\[Infinity]"], FractionBox[RowBox[List[SubsuperscriptBox["p", "k", "2"], "+", "1"]], RowBox[List[SubsuperscriptBox["p", "k", "2"], "-", "1"]]]]], "\[Equal]", FractionBox["5", "2"]]], "/;", RowBox[List[SubscriptBox["p", "k"], "\[Equal]", RowBox[List["Prime", "[", "k", "]"]]]]]]]]

 MathML Form

 k = 1 p k 2 + 1 p k 2 - 1 5 2 /; p k prime ( k ) Condition k 1 Subscript p k 2 1 Subscript p k 2 -1 -1 5 2 Subscript p k prime k [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[UnderoverscriptBox["\[Product]", RowBox[List["k", "=", "1"]], "\[Infinity]"], FractionBox[RowBox[List[SubsuperscriptBox["p_", "k", "2"], "+", "1"]], RowBox[List[SubsuperscriptBox["p_", "k", "2"], "-", "1"]]]]], "]"]], "\[RuleDelayed]", RowBox[List[FractionBox["5", "2"], "/;", RowBox[List[SubscriptBox["p", "k"], "\[Equal]", RowBox[List["Prime", "[", "k", "]"]]]]]]]]]]

 Date Added to functions.wolfram.com (modification date)

 2001-10-29