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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.
Crash is caused by a bug in OPs solution. Not a kata issue.
Your procedure for finding factors seems to be very incomplete. Does your solution work, and return a correct result, for sample tests? For
n=7919?But what is the bug in the kata? Is there something to fix in the kata? What? Why?