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Why is the number 1729 known as the Ramanujan number?

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Godfrey Hardy was a professor of mathematics at Cambridge University. One day he went to visit a friend, the brilliant young Indian mathematician Srinivasa Ramanujan, who was ill. Both men were mathematicians and liked to think about numbers. read more

The number 1729 is known as the Hardy- Ramanujan number after Cambridge Professor GH Hardy visited Indian mathematician Shrinivas Ramanujan at a hospital. As Hardy called his taxi number 1729 “dull”, Ramanujan exclaimed it was the “smallest number expressible as the sum of two cubes in two different ways,”as the sum of cubes of 1, 12 and also 10, 9. read more

1729 is the natural number following 1728 and preceding 1730. It is known as the Hardy-Ramanujan number, after an anecdote of the British mathematician G. H. Hardy when he visited Indian mathematician Srinivasa Ramanujan in hospital. read more

‘No, Hardy,’ said Ramanujan, ‘it is a very interesting number. It is the smallest number expressible as the sum of two [positives’ ] cubes in two different ways’ “ Another number which is expressible as the sum of two [positives’ ] cubes in two different ways is-4104= 16³ + 2³= 15³ + 9³. read more

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