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？-No. 1-52 card in a positive, progressive, from the first two, with two as the base, 2 is a multiple of the license over time, until finally a license; Then, from the first three starting with three to the base, 3 is a multiple of the license over time, until finally a license; Then ... from the first four starting to four as the base, 4 is a multiple of the license over time, until finally a license; ... followed by the five multiples of the licensing repotted once, 6, 7 to 52 until the base of the turn, the output : At this time positive signs of upward What?