Problem 20. Summing digits

Created by Cody Team

Solve Later

Given n, find the sum of the digits that make up 2^n.

Example:

 Input  n = 7
 Output b = 11

since 2^7 = 128, and 1 + 2 + 8 = 11..

Solve

Solution Stats

16091 Solutions
7755 Solvers

Last Solution submitted on May 10, 2025

Last 200 Solutions

Problem Comments

6 Comments

6 Comments

Show 3 older comments

Ned Gulley on 27 Jan 2012

The test suite was broken, as many of you suspected. I fixed it and rescored the problems.

Gareth Thomas on 19 Oct 2014

I like this problem:)

Da Lu on 6 Feb 2018

very interesting problem

Majid Farzaneh on 17 May 2018

Good

Syed Shahed on 2 May 2020

The test case 3 is totally wrong. It needs immediate correction. The code maker didn't notice that b=25 is a number not a single digit. If you're doing the sum of digits it always ends up with a single digit, it will never end up with number cause number itself is carrying multiple digits.

AMAR GAIKWAD on 26 Jun 2020

Just for the badge ; )

Solution Comments

Show comments

Problem Recent Solvers7755

Problem Tags

Community Treasure Hunt

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

Start Hunting!

Problem 20. Summing digits

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers7755

Suggested Problems

More from this Author96

Problem Tags

Community Treasure Hunt

Problem 20. Summing digits

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers7755

Suggested Problems

More from this Author96

Problem Tags

Community Treasure Hunt

Players