The book is now available! 5691
(just those submitted by Firoozbakht)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

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

+ p = 5*6*9*1 + 1 is the largest prime factor of 5691, and 5691 = p*(5+6+9+1). Note that 5691 is the only odd number with this property and also there exists only one even number with this property. [Firoozbakht]

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