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The first occurrence of a twin prime pair (659, 661) one of which is strobogrammatic and the other one invertible when read on a calculator (7-segment digital display). Note that the latter when turned upside down becomes also the larger member of another twin prime pair (197, 199). [Beedassy]

 

  Submitted: 2009-08-31 04:24:41;   Last Modified: 2009-08-31 07:09:48.



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