Anne McElvoy talks to Antonia Fraser, David Graeber and Jesse Norman. Simon Singh's Numbers Available now
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A Further Five Numbers 1729 - The first taxicab number
1729 is the smallest number you can write as the sum of two cubes, in two different ways.
First broadcast: 20 Sep 2005
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A Further Five Numbers G - The number that defines the universe
Newton's equation of gravity includes a number G, indicating the strength of gravitation.
First broadcast: 13 Sep 2005
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A Further Five Numbers Six degrees of separation
Six is often treated as 2x3, but has many characteristics of its own.
First broadcast: 06 Sep 2005
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A Further Five Numbers Two - At the double
Doubling is a form of exponential growth, which appears in population growth and inflation
First broadcast: 30 Aug 2005
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A Further Five Numbers One - The most popular number
One is the most popular number, as it appears more often than any other number.
First broadcast: 23 Aug 2005
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Another Five Numbers Game Theory
When 3G phone licences were sold, game theory was used to boost proceeds for the Treasury.
First broadcast: 31 Oct 2003
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Another Five Numbers Kepler's Conjecture
Is the 'face-centred cubic lattice' the most efficient way of stacking spheres?
First broadcast: 30 Oct 2003
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Another Five Numbers The Largest Prime
Can large prime numbers be used to form the basis of more secure encryption codes?
First broadcast: 29 Oct 2003
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Another Five Numbers The Number Seven
Are 7 shuffles sufficient to achieve a good degree of randomness in a deck of 52 cards?
First broadcast: 28 Oct 2003
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Another Five Numbers The Number Four
Are 4 colours enough to paint any map, so neighbouring countries have different colours?
First broadcast: 27 Oct 2003
