5 (five) is a positive integer following 4 and preceding 6. Its ordinal form is written "fifth" or "5th".

Properties Edit

5 is an odd prime number. Since 10 is a multiple of 5, divisibility by 5 can be easily tested in the decimal system — multiples of 5 always end in 0 or 5. 5 is a Fermat prime: 221 + 1 = 5.

A 5-sided star is known as a pentagram.

In googology Edit

Some googologisms based on 5 are superpent, googolquinplex and quintoogol. 5 is the length of the Goodstein sequence starting with 3, which goes 3, 3, 3, 2, 1.

In Greek-based number naming systems, 5 is associated with prefix penta-, and with prefix quinti- in Latin systems.

Googological functions returning 5 Edit

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