Difference between revisions of "Multifactorial number"

Latest revision as of 14:36, 20 July 2021

A Factorial number is defined by the product

n! = 1 \cdot 2 \cdot 3 \dots (n - 2) \cdot (n - 1) \cdot n

for $n \geq 1$ .

A Multifactorial number is denoted by

n!! = (n) \cdot (n - 2) \cdot (n - 4) \dots

n!!! = (n) \cdot (n - 3) \cdot (n - 6) \dots

and so on.

To clarify and make reading easier $n!!!!!$ is displayed as $n!_{5}$ .

@@ Line 2: / Line 2: @@
 A [[Factorial number]] is defined by the product
 :<math>n!  = 1 \cdot 2 \cdot 3 \cdots (n{-}2) \cdot (n{-}1) \cdot n</math>
-for <math>n &ge; 1</math>.
+for <math>n \geq 1</math>.
 A '''Multifactorial number''' is denoted by