Journal of Shanghai University(Natural Science Edition) ›› 2017, Vol. 23 ›› Issue (5): 722-731.doi: 10.12066/j.issn.1007-2861.1749

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Counting problem in multiplicative subsemigroups of positive integers

ZHU Xiaojie, YAO Weili   

  1. College of Sciences, Shanghai University, Shanghai 200444, China
  • Received:2015-11-13 Online:2017-10-30 Published:2017-10-30