This page is intended to provide some background information on Wilson\'s Theorem.

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Wilson\'s Theorem requires a basic understanding of "Modular" arithmetic.

In the simplest case, we can think about the following division problem:

23 / 5 = 4 with a remainder of 3

Therefore 23 ≡ 3 (mod 5)

The following Wikipedia page provides a great deal of information: Wilson\'s Theorem

There is also a short video overview available on You Tube

For a Really Simple example: let p=5, therefore (p-1)! = 4! = 24, and 24 ≡ -1 (mod 5)

A harder example: let p=7, therefore (p-1)! = 6! = 720, and 720 ≡ -1 (mod 7)

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