The book is now available! 2501
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:

+ The product of the only two primes (41 and 61) that can be the last two digits of a perfect fourth power. If you replace the 5 by a 4, you get a fourth power (2401).

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