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71 lines
986 B
Markdown
71 lines
986 B
Markdown
---
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id: 6a22d77ddf034bc4e35b1d58
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title: "Challenge 351: Pronic Number"
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challengeType: 28
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dashedName: challenge-351
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---
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# --description--
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Given a number, determine whether it is a pronic number.
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A pronic number is the product of two consecutive integers. For example, 6 is pronic because 2 * 3 = 6.
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# --hints--
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`isPronic(6)` should return `true`.
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```js
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assert.isTrue(isPronic(6));
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```
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`isPronic(15)` should return `false`.
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```js
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assert.isFalse(isPronic(15));
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```
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`isPronic(12)` should return `true`.
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```js
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assert.isTrue(isPronic(12));
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```
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`isPronic(132)` should return `true`.
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```js
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assert.isTrue(isPronic(132));
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```
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`isPronic(80)` should return `false`.
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```js
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assert.isFalse(isPronic(80));
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```
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`isPronic(0)` should return `true`.
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```js
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assert.isTrue(isPronic(0));
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```
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# --seed--
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## --seed-contents--
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```js
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function isPronic(n) {
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return n;
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}
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```
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# --solutions--
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```js
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function isPronic(n) {
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const k = Math.floor(Math.sqrt(n));
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return k * (k + 1) === n;
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}
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```
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