扑克牌问题 编号为1-52张牌，正面向上，从第2张开始，以2为基数，是2的倍数的牌翻一次，直到最后一张牌；然后，从第3张开始，以3为基数，是3的倍数的牌翻一次，直到最后一张牌；然后…从第4张开始，以4为基数，是4的倍数的牌翻一次， 直到最后一张牌；...再依次5的倍数的牌翻一次，6的，7的 直到 以52为基数的 翻过，输出：这时正面向上的牌有哪些？-The issue of ID cards for 1-52 cards, face up, to start from the first two to 2 as the base, is a multiple of 2 cards over once, until the last card　Then, from the first three starting 3 as the base, is a multiple of 3 cards over once, until the last card　then ... from the first four to start, 4 as the base, is a multiple of 4 cards over once, until the last card　... again followed by a multiple of 5 cards over once, 6, 7 to 52 for the base until the turn, the output: At this time cards face up what?