freeCodeCamp/guide/chinese/certifications/coding-interview-prep/project-euler/problem-145-how-many-reversible-numbers-are-there-below-one-billion/index.md

---
title: How many reversible numbers are there below one-billion?
localeTitle: 有多少可逆数字低于10亿？
---
## 问题145：有多少可逆数字低于十亿？

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