204 (two hundred
ndfour) is the
natural number following
203
Year 203 ( CCIII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Plautianus and Geta (or, less frequently, year 956 ''Ab urbe condit ...
and preceding
205.
In mathematics
204 is a
refactorable number. 204 is a
square pyramidal number
In mathematics, a pyramid number, or square pyramidal number, is a natural number that counts the number of stacked spheres in a pyramid with a square base. The study of these numbers goes back to Archimedes and Fibonacci. They are part of a broa ...
: 204 balls may be stacked in a pyramid whose base is an 8 × 8 square. Its square, 204
2 = 41616, is the fourth
square triangular number. As a
figurate number, 204 is also a
nonagonal number and a truncated triangular pyramid number. 204 is a member of the
Mian-Chowla sequence.
There are exactly 204
irreducible quintic polynomials over a four-element field, exactly 204 ways to place three non-attacking
chess queens on a 5 × 5 board, exactly 204 squares of an infinite chess move that are eight knight's moves from the center, exactly 204 strings of length 11 over a three-letter alphabet with no consecutively-repeated substring, and exactly 204 ways of
immersing an oriented circle into the oriented plane so that it has four double points.
Both 204 and its square are sums of a pair of
twin primes
A twin prime is a prime number that is either 2 less or 2 more than another prime number—for example, either member of the twin prime pair (41, 43). In other words, a twin prime is a prime that has a prime gap of two. Sometimes the term ''twin pr ...
: 204 = 101 + 103 and 204
2 = 41616 = 20807 + 20809. The only smaller numbers with the same property are 12 and 84.
In other fields
* In telecommunications,
area code 204 is a North American telephone area code for the Canadian province of
Manitoba. 204 is one of the original 86 area codes assigned in 1947 in the contiguous United States and the then-nine-province extent of Canada. More recently a second area code (431) was added to allow for the expanding phone number distribution within the province.
* 204 is the
HTTP status code
This is a list of Hypertext Transfer Protocol (HTTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. It includes codes from IETF Request for Comments (RFCs), other specification ...
indicating the request was successfully fulfilled and that there is no additional content to send in the response payload body.
* In a
poker
Poker is a family of comparing card games in which players wager over which hand is best according to that specific game's rules. It is played worldwide, however in some places the rules may vary. While the earliest known form of the game w ...
deck with a single wild joker, there are 204 hands that are at least as good as a
straight flush.
[ See also .]
*
Model 204 is a
database management system
In computing, a database is an organized collection of data stored and accessed electronically. Small databases can be stored on a file system, while large databases are hosted on computer clusters or cloud storage. The design of databases span ...
.
References
{{DEFAULTSORT:204 (Number)
Integers