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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.
Yes, too many ways to explain from the hints
true, but how do you know there is no case of 3 or more digits which is stationary?
even if it's true, it deserves an explanation in the code.
why is this so long?
In the case of two digits, the number of digits multiplied by 1 plus ten digits multiplied by 10, is no change.
Are you sure that (v < 100) is the same as "the solution is stable" (v == n)?
The last bomb is too bad
funny
Did you read the description?
in test case backWardsPrime2, 70207 is not a prime?