## Program for factorial of a number

Some information about these numbers can be found here and here. Visit chat. A deterministic factorial primality test.

Each permutation is an operation and there are n! This is in python 3.

## The factorial function

It is O M n log n log log n , where M n log n is the time for multiplying two numbers of size n log n. Multiply the two intermediate results.

The algorithm PrimeSwing , because it is the asymptotical fastest algorithm known to compute n!. Download a pdf-poster with 120 permutation trees!

A very short description of 21 algorithms for computing the factorial function n!. List all permutations of an array is O n!

Traveling Salesman has a naive solution that's O n! Divyanshu Maithani 5,193 17 32. An example of a PrimeSwing computation:. By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies.

## Recursive factorial

Home Questions Tags Users Unanswered. By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. Extra street-cred if the factorial time algorithm is the best known algorithm to solve the problem. The factorial of 21 is already too big to fit in a 64-bit unsigned long long int.

It works out better if you arrange for the numbers to be of roughly the same size. Hot Network Questions. Factorial algorithm more efficient than naive multiplication Ask Question.

If you do not attach great importance to high performance then get a BigInteger library and use: