Tag: Fibonacci

Posts

27 April 2015 / Paul Hankin / mathematics / computer science

This code, somewhat surprisingly, generates Fibonacci numbers.

def fib(n):
    return (4 << n*(3+n)) // ((4 << 2*n) - (2 << n) - 1) & ((2 << n) - 1)

In this blog post, I'll explain where it comes from and how it works.