The book is now available! 627626947
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:

+ The largest nine-digit left-truncatable prime such that when two of its digits are interchanged, the resulting number is also a left-truncatable prime. Can you locate the two digits in question? [Opao]

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