神秘数字6174--杨远锋的博客

神秘数字6174

[ 2011-1-23 9:43:00 | By: 杨远锋 ]

6174初看一点也不起眼，也许你会问它有什么神秘的呢？我们先进性一番计算，选择一个4位数，不能每位上的数都相同（也就是不能1111，2222，3333……），例如选择2009，先对这个数上的每位数字重新排列一下，得到最大的数是9200，最小的数是0029，两者想减，结果再按照上述规则继续下去
9200-0029=9171
9711-1179=8532
8532-2358=6174
7641-1467=6174
……
现在我们在随机选一个数：比如1234，那么
4321-1234=3087
8730-0378=8352
后面就不用再算了。6174这个数就是印度数学家卡布列克发现的卡布列克常数——任何4位数，你都可以在7步内计算得到6174，如果没得到，肯定算错了。

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原创

[ 2016-9-6 16:34:29 | By: 原创(游客) ]

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原创

[ 2016-9-28 16:08:08 | By: 原创(游客) ]

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原创

[ 2016-9-30 10:43:16 | By: 原创(游客) ]

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