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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 [10]: sum [ i | i <- [1..9], mod i 3 == 0 || mod i 5 == 0]
sum [ i | i <- [1..9], mod i 3 == 0 || mod i 5 == 0]
23
In [11]: sum [ i | i <- [1..999], mod i 3 == 0 || mod i 5 == 0]
sum [ i | i <- [1..999], mod i 3 == 0 || mod i 5 == 0]
233168