Multiples of 3 and 5

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 [1]:

    
# sample

s = 0
for i in range(1, 10):
    if i % 3 == 0 or i % 5 == 0:
        s += i

s









    Out[1]:





23



In [3]:

    
# solution

s = 0
for i in range(1, 1000):
    if i % 3 == 0 or i % 5 == 0:
        s += i

s









    Out[3]:





233168