Recreational number theory [...] is that part of number theory that is too difficult to study.
![Recreational number theory [...] is that part of number theory that is too difficult to study.](http://cdn.quoteddaily.com/images/hendrik-lenstra/recreational-number-theory--is-that-part-of-number-theory-that-is-too-difficult-to-study.jpg)
Recreational number theory [...] is that part of number theory that is too difficult to study.