What prime numbers when reversed are also prime?

Answer 1

Prime numbers that remain prime when their digits are reversed are called emirps. Some examples of emirps include 13 (31), 17 (71), 31 (13), and 37 (73). These numbers are interesting because both the original number and its reverse are prime numbers.

Answer 2

no,its not always......

for example see 23.........but it's reverse(32) isn't prime.