Five is the third smallest [[prime number]], and the only one divisible by 5, the next smallest prime is [[seven]]. Because it can be written as 2^(2^1)+1, five is classified as a [[Fermat prime]]. Five is the only prime number to end in the digit 5, because all other numbers written with a 5 in the ones place under the decimal system are multiples of five.
The number 5 is a [[Fibonacci number]], being [[two|2]] plus [[three|3]]. The next Fibonacci number is [[eight|8]].
