Problem 44696. Sum of unique multiples of 3 and 5

If we list all the natural numbers up to 15 that are multiples of 3 or 5, we get 3, 5, 6, 9, 10, 12 and 15. The sum of these multiples is 60.

Write a function called sum3and5muls that returns the sum of all the unique multiples of 3 or 5 up to n where n is a positive integer and the only input argument of the function.

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Solution Stats

63.96% Correct | 36.04% Incorrect
Last Solution submitted on Nov 17, 2025

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