摘要: Consider a positive integer N written in standard notation with k+1 digits a​i​​ as a​k​​⋯a​1​​a​0​​ with 0≤a​i​​<10 for all i and a​k​​>0. Then N is 阅读全文
posted @ 2018-12-08 19:23 lu_nacy 阅读(145) 评论(0) 推荐(0) 编辑