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Simon Singh's Numbers A Further Five Numbers Episodes

    1729 - The first taxicab number

    1729 is the smallest number you can write as the sum of two cubes, in two different ways.

    G - The number that defines the universe

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

    Six degrees of separation

    Six is often treated as 2x3, but has many characteristics of its own.

    Two - At the double

    Doubling is a form of exponential growth, which appears in population growth and inflation

    One - The most popular number

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