1是质数吗？
4:53
bilibili゚゚死神
1是质数吗？
"1"这个数字在自然数里是一个特殊的存在,它既不被归类为"合数(composite number)",也不被归类为"质数(prime number)";然而就质数的定义和性质来说,"1"这个数字其实很类似于质数 事实上,在过去的历史当中,"1"也曾经被某些数学家看成是质数 ...
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