November 21, 2016

On the Number 200

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A Polish square, a euro bill, your mom and NASCAR driver Richard Petty. What do they have in common? Hopefully nothing. But take out the fair lady and replace her with AppSpotr and… Tadaa! The number 200. Our very favorite one at the moment.

200 is the smallest base 10 unprimeable number, meaning it can’t be turned into a prime number by changing just one of its digits to any other digit. The number appears in the Padovan sequence, preceded by 86, 114, 151 (it’s the sum of the first two of these).

Incredible as this may sound, it gets even better. Because 200 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.
  • The temperature (in MeV) of quark-gluon plasma phase transition.
  • An HTTP status code indicating a successful connection.
  • The sum of pounds (or dollars) given in the classical Monopoly game to a player passing “Go”.
  • The highest cholesterol level considered “Desirable level corresponding to lower risk for heart disease”.
  • The number of NASCAR Cup Series races won by Richard Petty.
  • A year when some stuff happened.
  • The North West 200, a motorcycle race held in Northern Ireland.
  • The number of users reached by the world’s best app builder on November 20th of 2016, divided by a thousand.

Hooray! Thanks to all of you for supporting us and creating appic stuff on our platform. And thanks to Wikipedia for the immensely interesting copy/paste trivia. We’re already looking forward to 300.

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