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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.
Agreed, more of a Math problem than a programming problem. The implementation is so easy if you know the aliquot sum and its number theory.
The story doesn't make sense physically but I'm glad I tried. Solved in a way without any recursion in Dart and learnt a lot.
This really felt like a Math problem. 90% of the thinking was spent on coming up with the correct formula instead of programming techniques.