The book is now available! 1301
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:

+ The sum of all 3-digit PPDI's in base 10 (153, 370, 371, and 407) is prime. [Rupinski]

+ There are exactly 1301 nonisomorphic trees with thirteen vertices. [Patterson]

+ Bromotrifluoromethane, also known by the trade name Halon 1301, is a colorless, odorless, and non-toxic gas which extinguishes a fire by chemically reacting with the combustion process. It is now known to be environmentally damaging, particularly toward the Earth's protective ozone layer.

+ The only prime (emirp) equal to the sum of all the n-digit Narcissistic numbers (n=3, 153+370+371+407=1301). [Loungrides]

+ The sum of prime factors (with multiplicities) for the middle number in the smallest nontrivial eRAT triple. [Resta]

(There are 3 curios for this number that have not yet been approved by an editor.)

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