Problem 2672. Largest Geometric Series

Created by rifat

Solve Later

Extension of Ned Gulley's wonderful Problem 317.
In a geometric series, ratio of adjacent elements is always a constant value. For example, [2 6 18 54] is a geometric series with a constant adjacent-element ratio of 3.
A vector will be given. Find the largest geometric series that can be formed from the vector.
Example:
 input = [2 4 8 16 1000 2000];
 output = [2 4 8 16]; 
Update - Test case added on 21/8/22

Solve

Solution Stats

1360 Solutions
118 Solvers

Last Solution submitted on Jan 07, 2026

Last 200 Solutions

Problem Comments

3 Comments

3 Comments

Jean-Marie Sainthillier on 18 Dec 2015

Interesting problem but tests are too tricky.

Rafael S.T. Vieira on 16 Aug 2020

I am not sure that a list of equal numbers qualifies as a series. Would it be a geometric or an arithmetic series?

Lincoln Poon on 17 Feb 2021

'Randperm' is making this question a whole lot harder...

Solution Comments

Show comments

Problem Recent Solvers118

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Problem 2672. Largest Geometric Series

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers118

Suggested Problems

More from this Author44

Problem Tags

Community Treasure Hunt

Problem 2672. Largest Geometric Series

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers118

Suggested Problems

More from this Author44

Problem Tags

Community Treasure Hunt

Players