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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.
This task is ranked 4 kyu because it is meant to be solved in languages without BigInteger support. It was initially created in JavaScript before BigInt was a thing. Unfortunately, the kata aged very bad and spoiled by the fact that it was translated to languages with big integers, or bigintegers have been added to existing languages.
It is still relevant for C, C++, and some old languages, and languages which still have no bigint numeric types, but there's not many of those today.