Loading collection data...
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.
You can actually still improve this further if you'd like. You're iterating more times than you need to, and therefore checking too many numbers.
I'm having the same issue. Straight-ahead calculation of LCM takes way too long. :-)