The book is now available! 77777...31313 (27-digits)
(just those submitted by Gaydos)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

                                               7777777 7777771313 1313131313

Just showing those entries submitted by 'Gaydos': (Click here to show all)

+ Thirteen sevens followed by seven thirteens is an emirp. [Gaydos]

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