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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.
Here also, putting a range in as you did, 3070, 1530, runs my tests correctly (on my own node server), but here the expected results begin with a value lower than my starting value.
What code did you use to have this occur? I just ran isPrime against 3025 and it fails out correctly.