The book is now available! 2394649
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:

+ A 7-digit prime formed from the concatenated prime factors of 7-ones.

+ The concatenation in order of the multidigit prime factors, (239, 4649), of any 7-digit rep-digit number is prime. [Loungrides]

Prime Curios! © 2000-2018 (all rights reserved)  privacy statement