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freeCodeCamp/guide/english/certifications/coding-interview-prep/rosetta-code/kaprekar-numbers/index.md
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---
title: Kaprekar numbers
---
# Kaprekar numbers
---
## Solutions
<details><summary>Solution 1 (Click to Show/Hide)</summary>
```javascript
function isKaprekar(n, bs) {
if (n < 1) return false;
if (n == 1) return true;
for (var a = n * n, b = 0, s = 1; a; s *= bs) {
b += a % bs * s;
a = Math.floor(a / bs);
if (b && a + b == n) return true;
} return false;
}
```
</details>