product是乘积的意思. 问题译文：如果没有一个乘积包括多于一次的同样素数/质数,那么由素数5,7,11,13表达的正整数有多少个?选项是8,9,10,11,12（个） 共11个,如下： 5x7,5x11,5x13,7x11,7x13,11x13 5x7x11,5x7x13,5x11x13,7x11x13 5x7x11x13
请教一下112数学难题的第70题,how many positive integers can be expressed
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