Problem 290 题目发布于 2010-04-30 翻译更新于 2015-10-22 Problem 290 Digital Signature How many integers 0 ≤ n < 1018 have the property that the sum of the digits of n equals the sum of digits of 137n? 电子签名 有多少个0 ≤ n < 1018的整数，其各位数字和等于137n的各位数字和？