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 FactorInteger

 http://functions.wolfram.com/13.01.03.0056.01

 Input Form

 FactorInteger[-5!] == {{-1, 1}, {2, 3}, {3, 1}, {5, 1}}

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["FactorInteger", "[", RowBox[List["-", RowBox[List["5", "!"]]]], "]"]], "\[Equal]", RowBox[List["{", RowBox[List[RowBox[List["{", RowBox[List[RowBox[List["-", "1"]], ",", "1"]], "}"]], ",", RowBox[List["{", RowBox[List["2", ",", "3"]], "}"]], ",", RowBox[List["{", RowBox[List["3", ",", "1"]], "}"]], ",", RowBox[List["{", RowBox[List["5", ",", "1"]], "}"]]]], "}"]]]]]]

 MathML Form

 factors ( - 5 ! ) { { - 1 , 1 } , { 2 , 3 } , { 3 , 1 } , { 5 , 1 } } factors -1 5 -1 1 2 3 3 1 5 1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["FactorInteger", "[", RowBox[List["-", RowBox[List["5", "!"]]]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["{", RowBox[List[RowBox[List["{", RowBox[List[RowBox[List["-", "1"]], ",", "1"]], "}"]], ",", RowBox[List["{", RowBox[List["2", ",", "3"]], "}"]], ",", RowBox[List["{", RowBox[List["3", ",", "1"]], "}"]], ",", RowBox[List["{", RowBox[List["5", ",", "1"]], "}"]]]], "}"]]]]]]

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

 2001-10-29

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