10,000th Fibonacci - IGGI

http://appinventor.mit.edu/explore/master-trainers.html#nguyen

This app is created by MIT App Inventor to demonstrate its ability in CS courses, especially Algorithms.

It takes only around 1 second to calculate the 1,000th Fibonacci number and from 4 to 40 seconds for the 10,000th one depending on your phone specifications.

"By definition, the first two numbers in the Fibonacci sequence are either 1 and 1, or 0 and 1, depending on the chosen starting point of the sequence, and each subsequent number is the sum of the previous two. The Fibonacci sequence is named after Italian mathematician Leonardo of Pisa, known as Fibonacci."
https://en.wikipedia.org/wiki/Fibonacci_number