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从1到任何一个自然数n,只要对n反复进行下列两种运算,结果一定还会回到1: 如果n是偶数,就除以2;如果n是奇数,就乘3加上1。
From 1 to any natural number n, as long as the following two operations are repeated for n, the result will definitely return to 1: If n is an even number, divide by 2; if n is an odd number, multiply by 3 plus 1.