The book is now available! 181441
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:
 

Participate:
Share
+ 181441 [(9!+2)/2 = 13*17*821] is the first number of the form (n!+2)/2 that is not prime or the square of a prime.




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