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質數又稱素數.指在一個大於1的自然數中,除了1和此整數自身外,沒法被其他自然數整除的數.換句話說,只有兩個正因數(1和自己)的自然數即為素數. 合數指自然數中除了能被1和本身整除外,還能被其他的數整除的數.
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