The book is now available! 576
(another Prime Pages' Curiosity)
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+ 576 = sigma(5*7*6). Note that 576 is the first multi-digit number with this property. [Firoozbakht]

+ A square equal to (2 + 3 + 5 + 7 + 11)2 - (22 + 32 + 52 + 72 + 112). It's the only such case for all primes < 2,000,000,000. [Trotter and De Geest]




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