The book is now available! 9901
(just those submitted by Avrutin)
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Just showing those entries submitted by 'Avrutin': (Click here to show all)

+ 9901, 99990001, 999999000001, and 9999999900000001, are primes. [Avrutin]

+ 9901 divides 111111111111111111111111. [Avrutin]




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