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Back up to: Simon Singh's Numbers

1. 1729 - The first taxicab number

   1729 is the smallest number you can write as the sum of two cubes, in two different ways.
2. G - The number that defines the universe

   Newton's equation of gravity includes a number G, indicating the strength of gravitation.
3. Six degrees of separation

   Six is often treated as 2x3, but has many characteristics of its own.
4. Two - At the double

   Doubling is a form of exponential growth, which appears in population growth and inflation
5. One - The most popular number

   One is the most popular number, as it appears more often than any other number.