The book is now available! 643
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

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As Alois P. Heinz discovered, 643 is the smallest nonprime among integers a(n) greater than 1 so that multiplying the n-th highly composite number by a(n) will give a highly composite number. a(643) = 6 is not prime. [Post]

 

  Submitted: 2013-10-25 12:35:06;   Last Modified: 2018-12-22 19:30:02.



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