The book is now available! 949
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:
 

Participate:
Share
+ The largest palindromic two-sided semiprime. [Gupta]

+ 949 is the only known multi-digit palindromic number m such that m*m! - prime(m) is prime. [Firoozbakht]

(There are 2 curios for this number that have not yet been approved by an editor.)




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