Nice tutorial! I like project euler, but there's a point after the first bunch of problems when you need to learn more about math (such as the chinese remainder theorem), than you need to learn about the language. That's great and all, but I think there are other resources to continue your progression with the language.
If you still like the project euler format, maybe try exercism.io
I agree 100%. I eventually started jumping around to a bunch of different problems and I found the Monopoly question[0] to be a great source to test your programming skills that only deals a little with math.
On face value it sounds easy but I tried to implement my solution from a very high level with objects and interfaces. My thought was that at a later point I'd like to come back and flesh-out my solution to a full blown monopoly game. My language of choice at the time was Javascript.
If you still like the project euler format, maybe try exercism.io