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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.
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Dupe issue.
Language?
They're Pseudovampire Numbers
Pseudovampire numbers are similar to vampire numbers, except that the fangs of an n-digit pseudovampire number need not be of length n/2 digits. Pseudovampire numbers can have an odd number of digits, for example 126 = 6×21.
Straight from the Wikipedia page (http://en.wikipedia.org/wiki/Vampire_number)
The use a simplified definition for the exercise. They say: "Our loose definition of Vampire Numbers can be described as follows:"
Emphasis on 'loose'
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