13

This number is a prime.

Just showing those entries submitted by 'Bui Quang Tuan': (Click here to show all)

Photo credit: Patrick Kik
+ 13 is the smallest prime p such that p+(p-1)*(p-2) is not a prime. [Bui Quang Tuan]

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

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