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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Do you also get a crash when running your solution in your IDE locally? Did you know what input crashes your solution? You can read this for some hints.
I did run your solution in my VS and it crashes at line 35:
primes[j] = false;
for some numbers, for example933555431