2778. Sum of Squares of Special Elements

You are given a 1-indexed integer array nums of length n. An element nums[i] of nums is called special if i divides n, i.e. n % i == 0. Return the sum of the squares of all special elements of nums. Example 1: Input: nums = [1,2,3,4] Output: 21 Explanation: There are exactly 3 special elements in nums: nums[1] since 1 divides 4, nums[2] since 2 divides 4, and nums[4] since 4 divides 4. Hence