The book is now available! 191
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

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Question: What is the only prime whose square has five different digits that contain an even square digit in the middle with the first and last pairs being squares as well? Answer: 191. [Friend and Honaker]


  Submitted: 2018-04-05 09:18:31;   Last Modified: 2018-04-05 10:56:37.

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