Project Euler in a web site providing set of interesting programming and math-related tasks.
Example problem looks like
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
Find the sum of all the multiples of 3 or 5 below 1000
This problem could be easily solved with paper and pencil, but for other some programming skills are required:
The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17.
Find the sum of all the primes below one million
This web site also provides extended statistics of solved problems. You can check your score and compare it with other player scores. Cool point is that your score is being measure in percent "of genius" :)
Try this web site, I'm sure you'll experience many hours of math delight!
