# Project euler #2¶

Testing out "https://github.com/danielfrg/pelican-ipynb" , a plugin that allows you to blog with Jupyter notebooks.

## Problem definition¶

Project Euler #2 "https://projecteuler.net/problem=2", By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.

By using a loop (and not a recursive function) we avoid the only pit fall here, calculating the answer in very short time.

In [10]:

```
f1 = 0
f2 = 1
s = 0
while f2 < 4*10**6:
f1,f2 = f2, f1+f2
if f2%2 == 0:
s+= f2
print(s)
```