The book is now available! 55555333
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:

+ Five 5's followed by three 3's is prime. Is the only prime-digit prime that contains two distinct digits d with repetition of every digit d times. [De Geest and Loungrides]

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