what are hardy - ramanujan numbers and what kind of question can be asked on basis of these numbers? pls explain.

Hardy-Ramanujan numbers are natural numbers that can be expressedas the sumof 2 cubes in 2 different ways.

Eg:-

1729(1^{3},12^{3};9^{3},10^{3})

4104(2^{3},16^{3};9^{3},15^{3})

13832(18^{3},20^{3};2^{3},24^{3})

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