Question

Which of the following is a Hardy Ramanujan number?

• A. $20681$
• B. $20682$
• C. $20683$
• D. $20684$

Answer 1

The correct option is C $20683$

A Hardy Ramanujan number is a popular number which can be expressed as a sum of two cubes in two different ways. So, we can test any number based on this test.

So, here
$20683={27}^3+{10}^3={24}^3+{19}^3$

Hence, correct answer is option (C).