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freeCodeCamp/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-56-powerful-digit-sum.english.md
Kristofer Koishigawa 6cfd0fc503 fix: improve Project Euler descriptions, challenge seeds, and test cases (#38016)
* fix: improve Project Euler descriptions and test case

Improve formatting of Project Euler test descriptions. Also add poker hands array and new test case for problem 54

* feat: add typeof tests and gave functions proper names for first 100 challenges

* fix: continue fixing test descriptions and adding "before test" sections

* fix: address review comments

* fix: adjust grids in 18 and 67 and fix some text that reference files rather than the given arrays

* fix: implement bug fixes and improvements from review

* fix: remove console.log statements from seed and solution
2020-02-28 06:39:47 -06:00

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Markdown

---
id: 5900f3a41000cf542c50feb7
challengeType: 5
title: 'Problem 56: Powerful digit sum'
forumTopicId: 302167
---
## Description
<section id='description'>
A googol (10<sup>100</sup>) is a massive number: one followed by one-hundred zeros; 100<sup>100</sup> is almost unimaginably large: one followed by two-hundred zeros. Despite their size, the sum of the digits in each number is only 1.
Considering natural numbers of the form, <var>a<sup>b</sup></var>, where <var>a</var>, <var>b</var> < 100, what is the maximum digital sum?
</section>
## Instructions
<section id='instructions'>
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>powerfulDigitSum()</code> should return a number.
testString: assert(typeof powerfulDigitSum() === 'number');
- text: <code>powerfulDigitSum()</code> should return 972.
testString: assert.strictEqual(powerfulDigitSum(), 972);
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function powerfulDigitSum() {
// Good luck!
return true;
}
powerfulDigitSum();
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>