The book is now available! 674960891221
(another Prime Pages' Curiosity)
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674960891221 = 1!1 + 2!2 + 3!3 + ... + 12!12 + 13!13. [Sandri]

 

  Submitted: 2017-04-25 10:58:27;   Last Modified: 2017-04-25 10:59:17.



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