255 (number)

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "255" number – news · newspapers · books · scholar · JSTOR (January 2009) (Learn how and when to remove this template message)

255 (two hundred [and] fifty-five) is the natural number following 254 and preceding 256.

In mathematics

Its factorization makes it a

In base 10, it is a self number.

255 is a repdigit in base 2 (11111111), in base 4 (3333), and in base 16 (FF).

${\displaystyle \left\{{9 \atop 2}\right\}=255.}$

In computing

255 is a special number in some tasks having to do with computing. This is the maximum value representable by an eight-digit

• components in the
  24-bit RGB color
  model, since each color channel is allotted eight bits;
• any dotted quad in an IPv4 address; and
• the
  Delphi
  (255 being 100% visible and 0 being fully transparent).

The use of eight bits for storage in older video games has had the consequence of it appearing as a hard limit in many video games. For example, in the original