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Hardy asked Ramanujan this question?
Number of taxi - in mathematics, enta number of taxis, usually denoted Ta (n) or Taxicab (n), is defined as the smallest number that can be expressed as the sum of two cubes in the n different ways. GH Hardy and EM Wright proved in1954 that such numbers exist for all positive integers n. However, the evidence does not help in determining the consecutive numbers Ta (n). So far known taxi twelve consecutive numbers.
it is the smallest number that can be written as the sum of cubes in two different ways.
They say that Ramanujan was in the hospital when he answered that, and immediately after hearing the number. that man is a great mathematician.
The way I heard the story was that Hardy & Ramanujan were travelling in a car. Hardy saw the number of taxi in front of their car as1729, and he asked its significance from Ramanujan. Ramanujan replied within seconds that this is the smallest number which can be expressed as sum of cubes of two natural numbers in two different ways.
May be that is why Hardy later called them Taxi numbers.
Interesting question with interesting answer,it's a new information for me
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