Question

# 问题

Questions in category: 初等数论 (Elementary Number Theory).

## 设 $n$ 是正整数, 证明 $n$ 和 $n^5$ 具有相同的个位数.

Posted by haifeng on 2021-11-24 16:01:48 last update 2021-11-24 16:01:48 | Answers (1) | 收藏

Remark:

Prove that if $n$ is an integer, then $n$ and $n^5$ have the same units digit (first digit from the right).