The book is now available! 28
(another Prime Pages' Curiosity)
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28 is a perfect number expressible as the sum of first five nonprime numbers, i.e., 1 + 4 + 6 + 8 + 9 = 28. [Gaydos]

 

  Submitted: 2015-04-26 16:38:05;   Last Modified: 2016-08-14 13:34:03.



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