This is known as Ramanujam’s number. When the great Indian Mathematician was lying ill in hospital, Professor Hardy , who had been instrumental in bringing him to Cambridge, came to visit him.The taxi I came in, he said to Ramanujam, had a very boring number- .
Ramanujam said that is not boring at all, it is the only number that is sum of two cubes in two different ways
10^3 + 9^3 =1729
12^3 + 1^3 =1729
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