Emirps: An emirp is a prime number that results in a different prime when its decimal digits are reversed.
There is 20 Emirps smaller than 684.
Checkout Emirps up to: 100, 500, 1000, 10000.
13, 17, 31, 37, 71, 73, 79, 97, 107, 113, 149, 157, 167, 179, 199, 311, 337, 347, 359, 389