摘要：
Problem 63 https://projecteuler.net/problem=63 Powerful digit counts The 5-digit number, 16807=75, is also a fifth power. Similarly, the 9-digit numbe 阅读全文
摘要：
Problem 56 https://projecteuler.net/problem=56 Powerful digit sum A googol (10100) is a massive number: one followed by one-hundred zeros; 100100 is a 阅读全文