The book is now available! 168
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:

GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ The number of primes less than or equal to a thousand (pi(1000) = 168) equals the number of hours in a week (7 * 24 = 168). [Honaker]

+ 168 = sigma(sigma(sigma(1+6+8))) and 1+6+8 = pi(1*6*8). 168 is the only number with these two properties. [Firoozbakht]

+ All known prime powers p^n are pandigital for n > 168. [Gupta]

+ 168 is the product of the first two perfect numbers. [Laughlin]

+ The sum of all terms on the Ishango bone coincides with the number of primes less than a thousand, i.e., pi(1000) = 168.

(There is one curio for this number that has not yet been approved by an editor.)

Prime Curios! © 2000-2019 (all rights reserved)  privacy statement