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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.
The sieve of Eratosthenes was really usefull way to speed up my code with a bit of simple maths. Thanks
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This worked at around 3000 ms... A very challenging kata :) Finally I got it by using some of the ideas behind "The Sieve of Eratosthenes"