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.

http://projecteuler.net/problems

More puzzles:

http://www.mindcipher.com/

http://light-bot.com/hoc.html

http://playwithyourmind.com/

 

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