“200 (number)”的意思、由来-开放百科全书

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200 (number)

释义

References

{{Refimprove|date=December 2009}}{{Infobox number
| number = 200
| divisor = 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200
}}

200 (two hundred) is the natural number following 199 and preceding 201.

The number appears in the Padovan sequence, preceded by 86, 114, 151 (it is the sum of the first two of these).^[1]

The sum of Euler's totient function φ(x) over the first twenty-five integers is 200.

200 is the smallest base 10 unprimeable number – it can not be turned into a prime number by changing just one of its digits to any other digit. It is also a Harshad number.

Two hundred is also:

A common ISO-standard film speed for photographic films. However, 200 speed film is being phased out in consumer films in favor of faster films.
A denomination of the euro note. The 200 euro note was designed by Robert Kalina.
200 MeV is the temperature of quark–gluon plasma phase transition.
An HTTP status code indicating a successful connection; the code is "200 OK".
The sum of pounds (or dollars) given in the classical Monopoly game to a player passing Go.
A cholesterol level of 200 and below is considered "desirable level corresponding to lower risk for heart disease".
The number of NASCAR Cup Series races won by Richard Petty.
A year.
A vehicle that has reached 200 mph.
The North West 200, a motorcycle race held in Northern Ireland.^[2]

References

1. ^{{Cite web|url=https://oeis.org/A000931|title=Sloane's A000931 : Padovan sequence|last=|first=|date=|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-28}}
2. ^North West 200 http://www.northwest200.org/

1 : Integers

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