Factorial
lastmod 2018-08-17created 2014-06-122 edits
The factorial (Korean gyeseung, 階乘; North Korean standard language: charyegop) is the product of the consecutive natural numbers from 1 to . It is written with an exclamation mark (!), as in , and was first used by the mathematician Christian Kramp in 1808.
Definition
The factorial function is formally defined as follows.
Factorial.png
List of factorial results
- 0! = 1
- 1! = 1
- 2! = 2
- 3! = 6
- 4! = 24
- 5! = 120
- 6! = 720
- 7! = 5040
- 8! = 40320
- 9! = 362880
- 10! = 3628800
- 11! = 39916800
- 12! = 479001600
- 13! = 6227020800
- 14! = 87178291200
- 15! = 1307674368000
- 16! = 20922789888000
- 17! = 355687428096000
- 18! = 6402373705728000
- 19! = 121645100408832000
- 20! = 2432902008176640000