If you study mathematics or like math in general, the math related katas are fun.
If you are searching for a job or you are about to take a test, you are more stressed to learn and you're interested in the "useful" ones, so math related katas can be annoying in that case.
I had similar issues in the past. The thing that helped me was filtering katas, on the left part of the screen, select the appropriate tags.

Agree, should be at least 7.

I'll fork the translation for merge conflicts when the C++ situation has been cleaned up.

The reference solution should be inside a Describe block in C++.

The description became wrong after the C++ translation was approved.

As mentioned below, a translation approval forked up the description.

Yes, it should be fixed, no, we don't need multiple reminders of that.

It should be mentioned that in Java tests expect null instead of -1.
Tests or description should be fixed

The C++ translation fscked up. :/

Predictable, really. Author's first translation.

Why does it have random tests in Example tests, but not in Submit?