### From_ITK18_With_Love's blog

By From_ITK18_With_Love, history, 3 months ago,

Today, I get a problem.

Sum of greatest odd divisor of numbers in range $[a, b]$ with $a, b <= 10^9$

I found solution here : https://www.geeksforgeeks.org/sum-of-greatest-odd-divisor-of-numbers-in-given-range/

But I think the solution is not clear for the even number case.

Can find a better solution or more detailed explanation ?