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1729 is the smallest natural number that can be expressed as a sum of two cubes of positive number in two different ways:

1729 = 13 + 123 = 93 + 103

It is known as the Ramanujan-Hardy number. But is also known as a Taxicab number which are numbers that can be expressed as sums ot 2 cubes in 2, 3, 4, etc different ways.

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Q: What is the specialty of the number 1729 and what is the special name for it according to maths?
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