The book is now available! 769
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:
 

Participate:
Share
+ The prime 769 equals
sqrt(590593+sqrt(590593-sqrt(590593+sqrt(590593-...)))).
Note 590593 is a prime. [Caldwell]

+ prime(769) = prime(7)*prime(6)*prime(9) + phi(769). The prime 769 is the only known number (up to 2*10^9) with this property. [Firoozbakht]

+ The smaller of only two 3-digit primes p, (emirp), such that p^2 is a concatenation of three double-digit primes, i.e., 591361 = 769^2. The other such prime is 823. [Loungrides]

(There are 5 curios for this number that have not yet been approved by an editor.)




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