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1729 is the smallest number you can write as the sum of two cubes, in two different ways.
Newton's equation of gravity includes a number G, indicating the strength of gravitation.
Six is often treated as 2x3, but has many characteristics of its own.
Doubling is a form of exponential growth, which appears in population growth and inflation
One is the most popular number, as it appears more often than any other number.
When 3G phone licences were sold, game theory was used to boost proceeds for the Treasury.
Is the 'face-centred cubic lattice' the most efficient way of stacking spheres?
Can large prime numbers be used to form the basis of more secure encryption codes?
Are 7 shuffles sufficient to achieve a good degree of randomness in a deck of 52 cards?
Are 4 colours enough to paint any map, so neighbouring countries have different colours?