The book is now available! 1459
(just those submitted by Rupinski)
Prime Curios!
Curios: Curios Search:


Just showing those entries submitted by 'Rupinski': (Click here to show all)

+ The only four-digit prime number such that the sum of the first and second digits is the third digit, the sum of the second and third digits is the fourth digit, and the sum of the third and fourth digits is the first two digits. [Rupinski]

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