打开你的python, 输入:
>>> 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000//49
204081632653061224489795918367346938775510 2040816326530612244897959183673469387755102040816326530612244897959183673469387755102040816326530612244897959183673469387755102040
循环节有了吧?