Factorial Type Functions

Factorial- in mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example, ...click here to read more.

Hyperfactorials- Occasionally the hyperfactorial of n is considered. It is written as H(n) and defined by ....click here to read more.

Multifactorials- A common related notation is to use multiple exclamation points to denote a multifactorial, the product of integers in steps of two (n!!), three (n!!!)...click here to read more.

Primorials- In mathematics, and more particularly in number theory, primorial is a function from natural numbers to natural numbers similar to the factorial function, but rather than ...click here to read more.

Quadrupal factorials- The so-called quadruple factorial, however, is not the multifactorial n!(4); it is a much larger number given by (2n)!/n!, starting as...click here to read more.

Superfactorials- Neil Sloane and Simon Plouffe defined a superfactorial in The Encyclopedia of Integer Sequences (Academic Press, 1995) to be the product of the...click here to read more.