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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.
or are you talking about aosphyma's response?
I don't see how. Where will it match letters?
Good kata! Minor issue: the method countKprimes() is poorly named. It seems to return a count but it returns an array. Maybe call it findKPrimes() or buildKPrimes().
Suggestion to improve the line "And 216 / 12 = 18 (integer) and 18.12 = 216"
How about "And 12 evenly divides 216: 216 / 12 = 18"
Title suggestion: "Sum of Factors Evenly Divides Cube"
Method returns Boolean; probably should be boolean.