The book is now available! 78557
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:

+ The smallest positive odd integer k such that both k * 2n + 1 and k + 2n are composite for any positive integer n.

+ A Colbert number is any megaprime whose discovery contributes to the long sought-after proof that k = 78557 is the smallest Sierpinski number.

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