"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." Remove the 'wait time' block to get an answer instantly. Change the value of verbose to Y to better understand what is going on while is program is running.
http://projecteuler.net/problem=1