Supervisor does not give a research project I am a graduate student in pure Mathematics. My supervisor gave me an idea to work on, and in 6-9 months I found enough stuff to write 3 papers. After I did that, I was eager to work on some new idea, but my advisor only gave me learning projects, so that I just read many papers without doing any sort of research. After 6 months, I would like to start a research project, but all this reading didn't really help me in finding one (of course I thought about questions on my own, but since the area is quite old and competitive, I was not able to find a reasonable question that was not already answered). My advisor still does not give me anything concrete to work on, but merely suggests to read this or that paper. All of this is very weird, because his other students are treated very differently, they all have projects that started from ideas of the supervisor, and some of them even publish with him!

I am quite desperate, because I get really anxious about wasting my limited time, and I would like to know what you think about this.
Now that you've written three papers, you've shown you can solve problems. But you still need to learn the other important side of research: coming up with problems to solve. We can't know your advisor's motives with certainty, but I would guess he expects you to spread your wings and become more independent. Instead of asking him for projects, I suggest coming to him with project ideas of your own, and asking what he thinks.