The book is now available! 105
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:
 

Participate:
Share
+ Paul Erdős conjectured that this is the largest number n such that the positive values of n - 2k are all prime.

+ 105/pi4 = (1 + 1/24)(1 + 1/34)(1 + 1/54)(1 + 1/74)(1 + 1/114) .... [Ramanujan]

+ The first product of 3 distinct odd primes p. Note that p +/- 2 are primes. [Gallardo]

+ 105 is the first degree for which the cyclotomic polynom factor are not all 1, 0 or -1. [Cristian]

+ The largest natural number n for which all odd numbers k relatively prime to n, with 1 < k < n, are primes. It is also the largest for which 2n-p is prime for each prime p in [n, 2n-2]. [Capelle]

(There are 2 curios for this number that have not yet been approved by an editor.)




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