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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.
My implementation of word guessing "hello world" with a simple GA here: https://www.codewars.com/kata/reviews/5485e5af4a0944ae2200016b/groups/6409bd6e750cfd000106b13d
@Alexenon Yes I did. The sequence starts at n and you genenerate new values until a value is already seen in the sequence. Pick the maximum of them. This should work even for big (long) numbers.
Most likely, you are not including the initial n value. It also happened to me :)