found the answer. Doesn't seem to be easy.

来源: bangbang9814 于 2012-06-19 08:41:04 [] [旧帖] [给我悄悄话] 阅读数 : (52 bytes)
回答: 请教数学大侠们：Counting-off Puzzles 由 bangbang9814 于 2012-06-19 07:52:21

http://en.wikipedia.org/wiki/Josephus_problem

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