質數

例三、求100的以內的質數(檢查1~100,實際上1~10,因為10²=10x10=100) 1 (不是質數,劃去) 2 (是質數,去掉2的倍數4,6,8,10,12,14,16,...100,剩下2,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33 35,37,39,41,43,45,47,49,51,53,55,57,59,61,63,65,67,69,71,73,75,77,79,81 ...

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