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.
In [14]:
sum(i for i in range(1,1000) if i %3 == 0 or i%5==0)
Out[14]: