Monday, January 19, 2009

About the number 200

200 (two hundred) is the natural number following 199 and preceding 201. Roman numerals: CC

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

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.
  • The size of one side of the main square in Kraków, Poland (200 m×200 m)
  • 200 MeV is the temperature of quark-gluon plasma phase transition.
  • The name of a car made by the Rover Group — the Rover 200.
  • An HTTP status code indicating a successful connection.
  • The sum of 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"
  • "200" is the title of an episode of the television show Stargate SG-1.
  • The number of NASCAR races won by Richard Petty.
  • A Year.
  • The number of posts on the blog in search of a muse
That is all.

1 comment:

--jeff * said...

very cool way to commemorate your 200th post. (i just showed a finnish newspaper that had conan oi'brien, the finnish president, and "gustafsson" written on it, if i remember correctly).