HARDY-RAMANUJAN NUMBER ( TAXI-CAB NUMBER ) 1729

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Once Professor G.H. Hardy visited Indian mathematician Srinivas Ramanujan in hospital in a taxi number 1729. Mr. Hardy described the conversation between them as:

HARDY-RAMANUJAN NUMBER ( TAXI-CAB NUMBER ) 1729“I remember once going to see him when he was ill at Putney. I had ridden a taxi cab number 1729 and remarked that the number seemed to me rather a dull one, and that I hoped it was not an unfavorable omen. No, he replied, “it is a very interesting number; it is the smallest number expressible as the sum of two cubes in two different ways.””

It can be written in following two forms:
1729 = 123 + 13
1729 = 103 + 93

There is also a film based on the above mathematicians, The film name is "The man who knew infinity". See the poster below.


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