The book is now available! 4226
(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)

+ 4226 = phi(4)^sigma(4) + phi(2)^sigma(2) + phi(2)^sigma(2) + phi(6)^sigma(6). Note that 4226 is the earliest multi-digit number with this property. [Firoozbakht]




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