The book is now available! 332169193
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:
 

Participate:
Share
+ An emirp such that continually deleting the outermost digits gives a brilliant number at each step, 3216919 = 1511 × 2129, 21691 = 109 × 199, 169 = 13^2, 6 = 2 × 3. [Loungrides]




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