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256 (number)

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Title: 256 (number)  
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Subject: 257 (number), Power of two, 2 (number), Day of the Programmer, DBCS
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256 (number)

255 256 257
Cardinal two hundred fifty-six
Ordinal 256th
(two hundred and fifty-sixth)
Factorization 28
Roman numeral CCLVI
Binary 1000000002
Ternary 1001113
Quaternary 100004
Quinary 20115
Senary 11046
Octal 4008
Duodecimal 19412
Hexadecimal 10016
Vigesimal CG20
Base 36 7436

256 (two hundred [and] fifty-six, CCLVI) is the natural number following 255 and preceding 257.


  • In mathematics 1
  • In computing 2
  • In other fields 3
  • References 4

In mathematics

256 is a composite number, with the factorization 256 = 28, which makes it a power of two.

  • 256 is 4 raised to the 4th power, so in tetration notation 256 is 24.[1]
  • 256 is a perfect square (162).
  • 256 is the only 3-digit number that is zenzizenzizenzic. It is 2 to the 8th power or ((2^2)^2)^2.
  • 256 is the lowest number that is a product of eight prime factors.

In computing

One byte is equal to eight bits and has 28 or 256 possible values, counting from 0 to 255. The number 256 often appears in computer applications (especially on 8-bit systems) such as:

  • The typical number of different values in each color channel of a digital color image (256 values for red, 256 values for green, and 256 values for blue used for 24-bit color) (see color space).
  • The number of colors available in a GIF or a 256-color (8-bit) bitmap.
  • The number of characters in extended ASCII[2] and Latin-1.[3]
  • The number of columns available in a Microsoft Excel worksheet until Excel 2007.[4]
  • The split-screen level in Pacman, which results from the use of a single byte to store the internal level counter.
  • A 256-bit integer can represent up to 1.1579209e+77 values.[5]
  • Number of bits in the SHA-256 cryptographic hash.
  • The branding number of nVidia's GeForce 256

In other fields

256 is also:


  1. ^ "Power Tower." MathWorld. Archived April 27, 2014 at the Wayback Machine
  2. ^ "ASCII character chart." Microsoft. Archived January 19, 2013 at the Wayback Machine
  3. ^ "Windows 28591." Microsoft. Archived July 24, 2013 at the Wayback Machine
  4. ^ "Improving Performance in Excel 2007: The ‘Big Grid’ and Increased Limits in Excel 2007." Microsoft. Archived December 7, 2013 at the Wayback Machine
  5. ^ Creator(s) Of Google. "Google Search Engine Tools Results". Retrieved 10 September 2015. 
  6. ^ Casserly, Meghan. "Why Women Watch The Olympics." Forbes. 2010-02-05. Archived May 22, 2013 at the Wayback Machine
  7. ^ Kelly DH, Sansone FE (1981). "Clinical estimation of fundamental frequency: the 3M Plastiform Magnetic Tape Viewer". J Commun Disord 14 (2): 123–5.  
  8. ^  
  9. ^  
  10. ^ "Gracenote Lyrics: Three-Five-Zero-Zero." Archived June 28, 2011 at the Wayback Machine
  11. ^ "Oxford Companion to Military History: infantry." Archived May 22, 2013 at the Wayback Machine
  12. ^ "2010 Winter Games." NBC Olympics. Archived March 1, 2014 at the Wayback Machine
  13. ^ Traikos, Michael, Canwest Olympic Team. "Bronze makes Apolo Ohno the most decorated Winter Olympian in U.S. history." The Vancouver Sun. 2010-02-20. Archived February 23, 2010 at the Wayback Machine
  14. ^ "Hands-On With The 256-Player MAG Beta." Game Informer. 2010-01-06. Archived October 18, 2012 at the Wayback Machine
  15. ^ Baron, Salo W. (1957). Social and Religious History of the Jews - V.4 Meeting of East and West (2nd ed.). Columbia University Press. p. 96.  
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