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The smallest untouchable number, i.e., an integer that cannot be expressed as the sum of all the proper divisors of any positive integer (including the untouchable number itself). The first few are 2, 5, 52, 88, 96, ....

 

  Submitted: 1999-09-02 18:40:00;   Last Modified: 2008-08-03 09:00:31.



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