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素數2 23 37 合數10 12 15 27 51 54 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.比1大但不是素數的數稱為合數.1和0既非素數也非合數.素數在數論中有著很重要的地位.
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