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Josephus Permutations

James Dowdy1, Michael E. Mays1
1Department of Mathematics West Virginia University Morgantown, WV 26506

Abstract

The Josephus problem is concerned with anticipating which will be the last elements left in the ordered set \(\{1, 2, \ldots, n\}\) as successive $m$th elements (counting cyclically) are eliminated. We study the set of permutations of \(\{1, 2, \ldots, n\}\) which arise from the different orders of elimination as \(m\) varies, and give a criterion based on the Chinese Remainder Theorem for deciding if a given permutation can be interpreted as arising as a given order of elimination for some step size \(m\) in a Josephus problem.