The book is now available! 11111...11111 (25-digits)
(another Prime Pages' Curiosity)
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                                                 11111 1666116161 1666111111
+
     
     1 1 1 1 1
     1 6 6 6 1
     1 6 1 6 1
     1 6 6 6 1
     1 1 1 1 1
Ignoring this square-congruent prime of order 6 minus 1 is devilishly difficult!




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