Problem 20. Summing digits

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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..

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Last Solution submitted on May 27, 2026

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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 ; )

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