13

This number is a prime.

Just showing those entries submitted by 'Green': (Click here to show all)

Photo credit: Patrick Kik
+ The lesser member of the smallest twirp, i.e., a emirp pair such that each member also belongs to a twin prime pair. In this case, the associated primes are 11 and 29. [Green]

+ The smallest prime such that if its digits are rendered in a prime base p, the result, 13 (base p), is never prime. [Green]

+ There are 13 cards of each suit in a deck of playing cards. [Green]

+ 'Friday the 13th' is a franchise that consists of several movies, a television show, novels, comic books, and related merchandise. Submitted on Friday the 13th. [Green]

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

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell