The book is now available! 431729
(another Prime Pages' Curiosity)
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+ 431729 = prime((4*3*1*7*2*9)*(4+3+1+7+2+9)) - (4*3*1*7*2*9) *(4+3+1+7+2+9)). Note that 431729 is the smallest prime with this property. [Firoozbakht]




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