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I have to agree that the math is a bit too much. If you feel like doing algorithms / data structures work, though, perhaps leetcode will appeal to you: http://oj.leetcode.com/

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I liked the sound of leetcode, but I see the way to answer is with code (C++/Java) instead of a value answer. That ruins it for me.

I want to play with new programming languages, and see if the output is correct while I'm at it.

That's true. Another one mentioned in this thread is hackerrank: https://www.hackerrank.com/ - this one offers way more languages, except for rust, the one I'm actually learning :(

I saw that and just registered/tried.

Although it has Clojure (my target language), you still send code instead of an answer, and you get problems like not knowing what's available in terms of libs and whatnot.

This link may be helpful: https://www.hackerrank.com/environment

Also, you can usually find information about that kind of stuff in their IRC or even e-mail. They are usually pretty responsive.

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