def sum_natural_numbers_below_n(n): # O(N) complexity mult_3 = range(3, n, 3) mult_5 = range(5, n, 5) all_multiples = set(mult_3 + mult_5) return sum(all_multiples) print(sum_natural_numbers_below_n(1000))
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Discussion on: Project Euler #1 - Multiples of 3 and 5
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