The book is now available! 241
(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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241 = (22^2-2)/2. Can you find the next prime of form (t^2-2)/2, where t is a repdigit of form 2*(10^n-1)/9? [Honaker]


  Submitted: 2018-04-04 16:36:49;   Last Modified: 2018-04-04 23:00:06.

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