DSA-with-Javascript/B1 LEETCODE-Easy/Recursion/sum-multiples.js at master · yashkathe/DSA-with-Javascript · GitHub

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/*
Given a positive integer n, find the sum of all integers in the range [1, n] inclusive that are divisible by 3, 5, or 7.

Return an integer denoting the sum of all numbers in the given range satisfying the constraint.


Example 1:

Input: n = 7
Output: 21
Explanation: Numbers in the range [1, 7] that are divisible by 3, 5, or 7 are 3, 5, 6, 7. The sum of these numbers is 21.

Example 2:

Input: n = 10
Output: 40
Explanation: Numbers in the range [1, 10] that are divisible by 3, 5, or 7 are 3, 5, 6, 7, 9, 10. The sum of these numbers is 40.

Example 3:

Input: n = 9
Output: 30
Explanation: Numbers in the range [1, 9] that are divisible by 3, 5, or 7 are 3, 5, 6, 7, 9. The sum of these numbers is 30.

*/

var sumOfMultiples = function(n) {
    if(n < 0) {
        return 0;
    }
    return (n % 3 === 0 || n % 5 === 0 || n % 7 === 0) ? n + sumOfMultiples(n - 1) : sumOfMultiples(n - 1);
};