freeCodeCamp/curriculum/challenges/english/10-coding-interview-prep/project-euler/problem-206-concealed-squar...

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---
id: 5900f43a1000cf542c50ff4d
title: 'Problem 206: Concealed Square'
challengeType: 5
forumTopicId: 301847
dashedName: problem-206-concealed-square
---
# --description--
Find the unique positive integer whose square has the form 1_2_3_4_5_6_7_8_9_0, where each "_" is a single digit.
# --hints--
`concealedSquare()` should return `1389019170`.
```js
assert.strictEqual(concealedSquare(), 1389019170);
```
# --seed--
## --seed-contents--
```js
function concealedSquare() {
return true;
}
concealedSquare();
```
# --solutions--
```js
// solution required
```