veprime

veprime is a term that refers to a prime number that remains prime when its digits are reversed. For example, 13 is a prime number, and its reverse, 31, is also a prime number. Therefore, 13 is a veprime. Other examples of veprimes include 17, 37, 71, 73, 79, 97, 107, 113, 149, 157, and 167.

The concept of veprimes is related to palindromic primes, which are prime numbers that read the same forwards and backwards, such as 11, 101, and 131. However, veprimes do not need to be palindromic.

The study of veprimes is a branch of recreational number theory. While there is no known simple formula to generate veprimes, their distribution has been studied. It is known that there are infinitely many veprimes.

The term "veprime" itself is a portmanteau of "reverse" and "prime." It is a relatively new term in number theory, gaining more traction in recent years with the rise of computational number theory and online resources dedicated to prime numbers.