一道数学题(英文的)Call a positive integer N a 7-10 double if the digits of the base-7 representation of N form a base-10 number that is twice N.For example,51 is a 7-10 double because its base-7 representation is 102.And then the largest 7-10 double is?不要翻译器翻译的……

问题描述:

一道数学题(英文的)
Call a positive integer N a 7-10 double if the digits of the base-7 representation of N form a base-10 number that is
twice N.For example,51 is a 7-10 double because its base-7 representation is 102.And then the largest 7-10
double is?
不要翻译器翻译的……

调用一个正整数N 1 7-10双重如果基的N代表的7位数字组成一个基地10号是两次注例如,51是因为它的7-10双基- 7表示是102.然后最大的7-10双是什么?