13

This number is a prime.

Single Curio View:   (Seek other curios for this number)
The 13th of May 2011 will be a "double Friday the 13th," i.e., the sum of the digits of 5/13/2011 equals 13. The next time this will happen in a prime year is 1/13/2141. [Caldwell]

Submitted: 2006-10-15 17:03:55;   Last Modified: 2008-01-30 17:19:12.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell