The book is now available! 472393
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:
 

Participate:
Share
+ If a number can be written both as 2a2 + 1 and as 3b3 + 1, it must be of the form 648k6 + 1. The smallest prime of this form is not only 472393, where k = 3, but curiously k = 4 and k = 5 also. [Hartley]




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