The book is now available! 163800
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ 163800 = sigma(1!2*6!2*3!2*8!2*3!2*0!2*0!2). Note that 163800 is the smallest multi-digit number with this property. [Firoozbakht]




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