I'm not sure how to translate the equation into code (I don't even understand the equation to be honest). Please help if you can, thank you!

I'm seeing: Power[l,r] = Min value of subarray [l,r]^i multiplied by sum of [l,r]^i
So given the array below, here's what I'm seeing.
l = 0, r = 0, i = 0 = 1^0x1^0 = 1
l = 0, r = 1, i = 1 = 2^1x5^1 = 10
l = 0, r = 2, i = 2 = 2^2x8^2 = 68
l = 0, r = 3, i = 3 = 1^3x9^3 = 729

So I think I'm reading the equation wrong.

Input: list of ints
Output: sum of 'powers' of contiguous subarrays modded by a constant value as an int

powers is defined as:
image

eg input: : [2, 3, 2, 1]
output: 69