The book is now available! 198
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:

The nth Prime Page will now find any of the first 2.623˙1015 primes or π(x) for x up to 1017.

+ 198 is the first number between a twin prime pair such that if multiplied by its reversal (198 * 891) does the same! [Luhn]

+ 198 can be formed by concatenating 19 and 8. Note that 19 is the 8th prime number. Curiously, 198 is the (19*8)nd composite number! [Fazely]

+ The difference between any odd-digit emirp pairs is divisible by 198. [Green]

Prime Curios! © 2000-2016 (all rights reserved)