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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.
Ohh. You are right, sorry)
They're not primes? :P
Why 251 is correct and 125, 152 are not?
2 + 5 + 1 = 8 = 2 * 4how the hell sum of digits of 251 is multiple of perfect square?