One of the most important aspects of Brilliant is learning how to do problems; however, without solutions, it is very hard to learn how to do problems.
I am requesting that somebody keep a list of problems without solutions so members of Brilliant that solved the problem can share their solution. Additionally, it would be okay if the Brilliant staff made sure taht each problem had a solution associated with it.
The most notable problem is this one
Many solvers have solved the problem, yet no solution has been posted.
Another lies here