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:

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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.

The motivation for starting Project Euler, and its continuation, is to provide a platform for the inquiring mind to delve into unfamiliar areas and learn new concepts in a fun and recreational context.

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Give it a whirl.. it will activate parts of your brain you have probably ignored since university..