This question already has an answer here:
Yesterday, when I was playing with numbers, I was surprised to know the following relation:
Then, I've been looking for the other solutions, but I'm facing difficulty. Then, here are my questions.
Question 1 : Does there exist the other non-trivial solution?
Question 2 : Can we get all solutions? In addition to this, can we prove that they are all solutions?
I don't know if these questions are famous. Also, I'm afraid that these questions might be very easy to solve. Anyway, I need your help.