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The smallest prime with a multiplicative persistence (i.e., the number of times the digit product must be iterated in order to reach a single-digit product) of 11: 277777788888989 --> 4996238671872 --> 438939648 --> 4478976 --> 338688 --> 27648 --> 2688 --> 768 --> 336 --> 54 --> 20 --> 0. [Beedassy]

 

  Submitted: 2009-02-28 17:45:53;   Last Modified: 2009-02-28 19:07:20.



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