2021年7月24日
Have Fun with Numbers
摘要： Notice that the number 123456789 is a 9-digit number consisting exactly the numbers from 1 to 9, with no duplication. Double it we will obtain 2469135 阅读全文
posted @ 2021-07-24 22:21 zonkidd 阅读(26) 评论(0) 推荐(0) 编辑