Posted by Kris on Sunday, November 30, 2008 at 3:40pm.
A book called The Penguin Dictionary of Curious and Interesting Numbers by David Wells (1986) contains fascinating numbers and their properties. One of which is the only 3digit numbers that are prime and all rearrangements of their digit are also prime are 113,119, and 337. Find the 2digit numbers that also have this property.

Math  Damon, Sunday, November 30, 2008 at 3:44pm
11  11
13  31
17  71
19  91
37  73
I am getting bored, you keep going