The book is now available! 123479
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:
 

Participate:
Share
+ The product of the first n digits of 123479 (read left-to-right) is either one less or one more than a prime.

+ The smallest prime formed from all of the positive digits that are expressible as sum of two triangular numbers in exactly one way. [Honaker]




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