A while back some of us discovered and subsequently lost days to “The Python Challenge“. Well.. prepare to write off a little more time, and check out “Project Euler“. From its about page: ” What is Project Euler? Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve. Although mathematics will help you arrive at elegant and efficient methods, the use of a computer and programming skills will be required to solve most problems.