The book is now available! 4
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:
 

Participate:
Share
Single Curio View:   (Seek other curios for this number)

 

There are 4 known positive integers n such that the sum of all primes smaller or equal to n divides n(n+1)/2. This sum also divides the sum of all nonprimes smaller or equal to n. Note that 4 is the smallest positive integer with this property. [Capelle]

 

  Submitted: 2009-08-11 01:04:27;   Last Modified: 2009-08-11 07:16:02.



Prime Curios! © 2000-2017 (all rights reserved)