Definition:Hardy-Ramanujan Number/Historical Note

Historical Note on Hardy-Ramanujan Number
The anecdote related by about a visit to  in hospital in a taxicab whose number was $1729$ is well-known and often repeated.

The concept was first introduced by in $1657$, who discovered $5$ instances of these numbers, including $1729$, in response to a challenge by.

Those are the numbers referred to as taxicab numbers on, following the lead of on the.

However, the deeper concept of the Hardy-Ramanujan numbers is more recent.

After $1729$, the next Hardy-Ramanujan number $\operatorname {Ta} \left({3}\right)$ was discovered by in $1957$ to be $87 \, 539 \, 319$.