Wednesday, June 10, 2009

131

131 is a prime number. It is a Sophie Germain prime because 2 x 131 + 1 = 263 is also prime.

The
131st Fibonacci number (1066340417491710595814572169) is the smallest Fibonacci prime that contains all the digits from 0 to 9.

131 is the smallest prime that stays prime when the end digits (on both sides) are repeated once: 11311 is also prime.

131 is the smallest integer such that the sum of its digits in every base b = 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 is prime.


Locomotive
131 plunges off the edge of a ravine in the movie Back to the Future Part III.

Source:
Prime Curios!

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