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204 (number)
| Field | Value |
|---|---|
| number | 204 |
| divisor | 1, 2, 3, 4, 6, 12, 17, 34, 51, 68, 102, 204 |
204 (two hundred [and] four) is the natural number following 203 and preceding 205.
In mathematics

204 is a refactorable number. 204 is a square pyramidal number: 204 balls may be stacked in a pyramid whose base is an 8 × 8 square, as it is a sum of all the perfect squares from 1 to 64 (i.e. 12 + 22 + 32 + 42 + 52 + 62 + 72 + 82 = 204). Its square, 2042 = 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: 204 = 101 + 103 and 2042 = 41616 = 20807 + 20809. The only smaller numbers with the same property are 12 and 84.
In other fields
- 204 is the HTTP status code indicating the request was successfully fulfilled and that there is no additional content to send in the response payload body.
References
References
- {{Cite OEIS
- {{Cite OEIS. A000330
- {{Cite OEIS. A001109
- {{Cite OEIS. A001106
- {{Cite OEIS. A051937
- {{Cite OEIS
- {{Cite OEIS. A027377
- {{Cite OEIS. A047659
- {{Cite OEIS. A018842
- {{Cite OEIS. A006156
- {{Cite OEIS. A008980
- {{Cite OEIS. A213784
- [http://tools.ietf.org/html/rfc7231#section-6.3.5 Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content], itef.org, retrieved 2014-07-29.
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