The book is now available! 84
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:
 
Participate:
+ Its digits are composite. Yet each digit minus 1, the sum of the digit minus 1 and the absolute value of the difference of the digits minus 1 is prime. [Russo]

+ The product of its digits minus 1 is prime. [Wolfe]

+ 84 is the smallest number that can be expressed as the sum of 3 distinct primes raised to distinct prime exponents (25 + 33 + 52). [Russ]

+ 84!2 + prime(48) is prime. [Firoozbakht]

+ 84 = prime(prime(8))+prime(prime(4)). It is the only such number. [Firoozbakht]



Prime Curios! © 1999-2009 (all rights reserved)