thanks :) your kata is pretty good too

Long gone is the time when implementing algorithms of this level was interesting to me.

Thanks;-)!

Last night they were doing server maintenance. I'm guessing they dont have everything back up and running yet. I'm getting the same 504 error.

Half an hour ago, I got a proper response when I ran the tests, but right now, nothing seems to work. Even the dummy solution times out, although it doesn't really do anything. Codewars isn't working at the moment. I guess you'll have to try again later. :-(

I just tried to run the tests and got a strange error: "Error 504 ... This error was caused due to an issue processing the web request, not because of an issue executing your code. Please try again." Looks like Codewars is having problems. Maybe these are relevant: https://github.com/Codewars/codewars.com/issues/688 https://codewars.statuspage.io/

It's quite possible that your code is not quite fast enough. You'll need to use a clever algorithm to generate a million primes in a few seconds. If the code takes too long, the server times out. I guess you should add a few more example tests that generate more primes and see how many your code can produce before the server times out.