The Fibonacci series is a sequence of numbers that begins 1, 1, 2, 3, 5, ...
There are lots of cool facts about the Fibonacci series, but here are some you may not yet know:
Every 3rd number is a multiple of 2.
Every 4th number is a multiple of 3.
Every 5th number is a multiple of 5.
Every 8th number is a multiple of 7.
Every 15th number is a multiple of 10.