The book is now available! 1230507001
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:

+ Write digits from 2 to 9. Replace the composite digits by a 0. Sandwitch the number between two 1's. The resulting number is a prime. Its digit reversal is also a prime. [Murthy]

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